CALL US (855) 998-8726 HEADER - 04-21 STI, 02-14 WRX, 04-13 FORESTER XT 05-09 LEGACY(113026)
9999991
GrimmSpeed UNEQUAL LENGTH HEADER - 04-21 STI, 02-14 WRX, 04-13 FORESTER XT, 05-09 LEGACY GT, 05-09 OUTBACK XT(113026)
Over the years, GrimmSpeed Engineers have proven that we are capable of manufacturing the  highest quality, best performing exhaust components  for the Subaru aftermarket. While we might not always be the first to release a certain product, our major advantage is that we can take our time in testing and ...
GrimmSpeedGrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13 FO
GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13 FO
GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-2
GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-3
GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-4
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GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13 FOGrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-2GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-3GrimmSpeed HEADER - 04-21 STI, 02-14 WRX, 04-13-4

GrimmSpeed

GrimmSpeed UNEQUAL LENGTH HEADER - 04-21 STI, 02-14 WRX, 04-13 FORESTER XT, 05-09 LEGACY GT, 05-09 OUTBACK XT(113026)

$999.00

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Over the years, GrimmSpeed Engineers have proven that we are capable of manufacturing the  highest quality, best performing exhaust components  for the Subaru aftermarket. While we might not always be the first to release a ...
  • Innovative 1.5 to 1 Unequal Length Runners - Each bank of runners is equal length, allowing for equal length performance with an unequal length sound
  • 4-into-1 Low-Angle Merge Cast Collector - Ensure minimal restriction and maximum performance
  • Smooth, Restriction-Free Flow Throughout - Single piece mandrel bent tubing welded to a single piece merge collector removes unwanted steps
  • Substantial Power/Torque Gains - +25hp and +25ft/lbs of torque over stock
  • Quickest Spooling Aftermarket Header - Faster spool and more power compared to the competition
  • No Tune Required - Safe to run, just bolt on
  • Gaskets and Hardware Included - Everything you need to get installed and on the road
  • Designed To Fit With Aftermarket Oil Pans - Fits with the STI oil pan or popular aftermarket options
  • Full 304 Stainless Steel Construction - 1/2" flanges and 14ga runners for extreme durability
  • Manufactured and Welded In The USA - For consistency and top quality control
  • For more questions about this product, please Contact Us
Description

Over the years, GrimmSpeed Engineers have proven that we are capable of manufacturing the highest quality, best performing exhaust components for the Subaru aftermarket. While we might not always be the first to release a certain product, our major advantage is that we can take our time in testing and development, putting the product through countless hours and thousands of miles of testing. This ultimately ensures that once a component is in your hands, it will be the most-refined version of that product available. The all new GrimmSpeed Unequal Length EJ Header is a perfect example of this.

Our Unequal Length Header for the EJ-Series engines is very much the same. There are countless options out on the market for high-performing equal length header, but if you want to keep that classic Subaru rumble, there aren’t many great options.

The OEM EJ header really hasn’t changed much in the past 20+ years and it shows. The tight geometry and long cross-pipe between the two collectors are not optimized for flow or power. While the smaller diameter and volume may be good for low-end spool, the factory header gets choked out higher in the rev range. Simultaneously, it's known that swapping to a more-equal length manifold with larger diameter runners offers additional performance potential. We set out to create a header that would be the best of both worlds, offering great performance and the unique sound that makes your car unmistakably a Subaru!

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While other aftermarket unequal length headers use different runner lengths for each cylinder, our proprietary design utilizes an innovative setup where each bank of runners are equal length, but one set is 1.5 time the length of the other, providing the rumble sound that we all love while maintaining the performance of an equal length setup. We utilize single piece, mandrel bent runners to minimize disturbances to the exhaust gas along with an extremely durable cast 304 stainless steel collector to achieve keep each back of runners truly equal length which would be difficult to accomplish with a 4-into-1 welded collector. The low angle merge this collector makes for faster spool and unbeatable off-boost throttle response. To match this flow, the collector features machined internal diameters to perfectly match the 1 ¾” primary runners and 2” secondary pipe, eliminating unwanted “steps” in the exhaust flow.

As with all of our exhaust components, our Unequal Length Header features ½ inch flanges for both the heads as well as the up-pipe side. These combined with the 14 gauge runner pipes make for extreme durability and heat retention.

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We started the R&D process by scanning the underside of of several EJ engine setups using a FARO arm. This allowed us to design and simulate our header in a digital 3D space to find the optimal balance of runner lengths and angles for the best performance possible on an unequal length setup. Next, we were able to 3D-print a variety of different configurations that would allow us to narrow in on the most optimal final design. During this process, we were able to form the header around a variety of different STI oil pan setups, from the factory pan to aftermarket options like those offered by IAG and Killer B Motorsports. After we were satisfied, we made pre-production prototype units that were put through months of punishing performance and longevity testing.

To validate our simulated performance, we did extensive real-world dyno testing comparing our header design to the factory header as well as some of the most popular headers on the market, both unequal length and equal length. For our testing, we used a 2010 STI with the stock turbo and basic bolt-ons as well as our 2020 STI shop car with full GrimmSpeed Stage 3 bolt-ons, E85, and a GrimmSpeed BB500 turbocharger. Throughout all of our testing, we kept the same tune loaded as well, so the only variable was the header that was installed.

 

With the factory turbocharger, the GrimmSpeed Header does experience a loss in spool when compared to the stock manifold, but we still saw maximum gains of 23.1 ft/lbs and 10.3 hp while averaging 1.6 lbs of boost less than the stock setup. Overall, the GrimmSpeed Header shifts the power curve further to the right, so it's clear that the OEM manifold was designed for low-end response but falls off higher in the rev range. 

 

The GrimmSpeed exhaust manifold exhibits a loss of spool when compared to the stock header by 100rpm as well as producing over a pound less boost. However, the engine is outputting the same amount of torque, showing that the low and off-boost characteristics of the collector design balance out the changes from the differences in the rest of the header. The GrimmSpeed exhaust manifold makes less boost everywhere, but more power everywhere as well due to the increase in efficiency. Overall, we were able to achieve maximum gains of 25whp and 25 ft/lbs of torque when compared to the stock header.

 

When comparing the GrimmSpeed UEL Header to other unequal length offerings on the market, we were surprised to see that other header options really didn’t offer any upgrade over the factory header in terms of power or spool. The GrimmSpeed Header was able to easily out-spool the competition by 200 rpm and hold an average of 2psi of boost overall allowing for substantial maximum gains of 75 ft/lbs and 57 hp.

The GrimmSpeed Header out spooled the competition’s equal length header by 50rpm while making similar boost levels. Our Header produces more torque than the equal length manifold right out of the gate, producing about 15ftlbs more throughout spool up. At peak, the GrimmSpeed Header was able to produce and extra 2 ft/lbs of torque and an additional 21 hp compared to the equal length setup.

Features:

  • Innovative 1.5 to 1 Unequal Length Runners - Each bank of runners is equal length, allowing for equal length performance with an unequal length sound
  • 4-into-1 Low-Angle Merge Cast Collector - Ensure minimal restriction and maximum performance
  • Smooth, Restriction-Free Flow Throughout - Single piece mandrel bent tubing welded to a single piece merge collector removes unwanted steps
  • Substantial Power/Torque Gains - +25hp and +25ft/lbs of torque over stock
  • Quickest Spooling Aftermarket Header - Faster spool and more power compared to the competition
  • No Tune Required - Safe to run, just bolt on
  • Gaskets and Hardware Included - Everything you need to get installed and on the road
  • Designed To Fit With Aftermarket Oil Pans - Fits with the STI oil pan or popular aftermarket options
  • Full 304 Stainless Steel Construction - 1/2" flanges and 14ga runners for extreme durability
  • Manufactured and Welded In The USA - For consistency and top quality control
P65 Warning: This product can expose you to chemicals including chromium (hexavalent compounds), which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.p65warnings.ca.gov
Application List
ImageSKU / Part NoApplicationDetailPriceAdd to Cart
 113026Subaru Baja (2004-2006)$999.00BUY
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 113026Subaru Forester (2004-2008) - XT$999.00BUY
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 113026Subaru Forester (2009-2013) - XT$999.00BUY
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 113026Subaru Impreza (2003-2007) - WRX$999.00BUY
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 113026Subaru Impreza (2004-2014) - WRX STI$999.00BUY
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 113026Subaru Impreza (2006-2007) - WRX TR$999.00BUY
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 113026Subaru Impreza (2006-2007) - WRX Limited$999.00BUY
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 113026Subaru Impreza (2007) - WRX STI Limited$999.00BUY
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 113026Subaru Impreza (2008-2014) - WRX$999.00BUY
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 113026Subaru Impreza (2008-2014) - WRX STI$999.00BUY
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 113026Subaru Impreza (2009-2014) - WRX Premium$999.00BUY
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 113026Subaru Impreza (2010-2014) - WRX Limited$999.00BUY
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 113026Subaru Impreza (2010) - WRX STI Special Edition$999.00BUY
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 113026Subaru Impreza (2011-2014) - WRX STI Limited$999.00BUY
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 113026Subaru Legacy (2005-2009) - XT$999.00BUY
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 113026Subaru Outback (2005-2009) - XT$999.00BUY
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 113026Subaru WRX (2015-2021)$999.00BUY
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 113026Subaru WRX (2015-2021) - STI$999.00BUY
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Return Policy

At JM Auto Racing we make returns and other client services as easy as possible. Our mission is to provide you with the best products and the best service in the automotive industry. We understand that sometimes, clients change their minds about products that they order or simply do not need them anymore. We also know that clients are cautious about terms and conditions since they are often tricky and misleading. Our goal is to make the return or exchange process trustworthy and as simple as 1-2-3.

Returns & Exchanges
If you are not satisfied with your purchase for any reason, we will be happy to accept a return for a refund or exchange on products in new/unused condition within 30 days of delivery. For orders placed during the holiday season from November 15th to December 31st, the return period is extended to 60 days. The following rules apply:

  • All returns and exchanges must be made via our Return Procedure with a valid & signed RMA form.
  • Returns will have a flat 15% restocking fee.
  • Product(s) must be in new condition and in the original packaging (please do not assemble, install, or modify the product in any way). In the event of fitment, flaw or defect pictures may be necessary to complete your request.
  • Any product that was used or fully/partially installed is non-returnable.
  • In some cases, return of the physical product may not be required. For these products, instructions will be provided on how to process a field destroy or dispose of the original item.
  • The few exceptions for items that cannot be returned include:
    • Items classified as “special order” or “made to order”
    • Custom Wheels & Tires Packages
    • Electronics
    • Any non-EPA compliant product including but non limited to catless test pipes, downpipes, headers and high flow cats. We will try to make as many accomadations as possible however a 25% restocking fee will apply. Please contact us to learn more.
  • To start your return please click HERE

Cancellations
We all know that things happen a people change their mind as soon as the purchase things. We take pride in how quickly we get things out the door and with 4 warehouses to ship from plus stock owned at our manufacturers, that speed is always increasing. This is why we only except full cancellations within 30 minutes of placing an in stock order. This helps us ensure your package gets out on the truck immediately or can be flagged before it goes through the packaging process. For orders that are not in stock or special order, we allow 24 hours. Cancellations can be done online by following the instructions found HERE or by emailing [email protected] ,

Your request will be processed as quickly as possible, but please note that sometimes products ship quicker than expected. After 24 hours, or after an out of stock item has been confirmed, fees will apply to all cancellations with the exception of Special Order items, made to order items or custom built items; which can not be cancelled after the 24 hour period. Items confirmed on reserve or pre-ordered are subject to a 10% cancellation fee.

Cancellations are subject to a 10% cancellation fee. This fee is not to rip you off in any way. When you place an order, we lose 3% due to credit card processing, and also another 3% to credit your account. The other 4% is much less then what is needed to cover all other costs and expenses lost by cancelling an order, that was already processed. This fee is will only be imposed on orders that have not shipped. If a special order has been placed, such as pistons, turbo's, etc., and the items are built and ready to ship out, and a cancellation is requested, a 25% cancellation fee will be imposed IF possible to be cancelled.

  • To start your cancel please click HERE

What are my shipping fees?
For orders delivered within the continental US where reason for return isn't a result of a JM Auto Racing error, the cost of the initial shipping charge and a return fee will be deducted from your refund. A prepaid shipping label(s) will be provided.
Freight, international & non-continental US returns are accepted, however coordination of return shipping is the responsibility of the client. In the event an error is made by JM Auto Racing, a return shipping label will be provided.

Сore deposits
Some products sold on JM Auto Racing include a core deposit. These parts have a deposit that is charged upon purchase and fully refunded upon the return of the core. Cores must be in rebuildable condition and matching vehicle application to the product sold. Once the product is received and inspected, the deposit will be refunded to your original form of payment. Note: Product cores returned that are not fully assembled or are not the unit that was removed from the vehicle, will not be refunded and the core will be discarded. Detailed instructions on Core Deposit Returns can be found here.

Defective, damaged, or incorrect products
We all know that accidents happen sometimes. If your product(s) arrive defective, damaged, or simply incorrect, please contact our customer service department as soon as possible. Please do not attempt to use, install, modify, or repair the part! We will send you a replacement part and provide you with a prepaid return label to return the defective part. In some instances, return of the product may not be required. Products must be returned to us within 30 days. If the damage was caused by a shipping courier, we will schedule a damage pick up by the courier. Photos of the damage, defect, or fitment issue may be requested in order to correctly process your request. For items mispackaged or missing, returns and replacements will be handeled as warranty requests, subject to manufacturer involvement and normally handled within 24-48 hours. Please note that products must be in the original packaging and there are additional requirements for products that ship freight.

LTL and Freight Shipments will cover the delivery of most oversized items, including but not limited to, body kits, hoods, trunks, spoilers, doors, roll cages. Items should be thoroughly inspected at time of delivery. Any damage NEEDS to be notated on the Bill of Lading prior to the driver leaving for an insurance to be valid. If damage, is not noted, the insurance is voided out and will need to be dealt with between you and the shipping carrier.

Billing, refunds & credits
Payment for orders placed using PayPal of Affirm will be captured as soon as the order has been successfully placed. Payments for orders placed using a debit or credit card will be authorized only and captured upon shipping. What does this mean? If your order is in stock, it will be charged normally. For out-of-stock items arriving within 30 days, you may see the authorization temporarily fall off. The funds will be placed back into your account and you won't see the pending charge from us. Once the item ships, you will see the funds deducted and the charge posted to your account. For out-of-stock items after 30 days, the above will take place, however we will have to recharge your card once the item is ready to ship.

Refunds for returned products are issued with 3-5 business days once they are received by our warehouse and inspected. Refunds will be issued via the same payment method originally used to place the order (Credit Card, PayPal, Google, Affirm, Check). All returns, where JM Auto Racing is not at fault, will have 15% restocking fee less than cost of freight. Free shipping items will have the initial freight fees deducted from the final refund. Shipping is only free if you keep the item you purchased. Some items will have a higher restocking fee. This information will be revealed to you up front upon requesting a return. Once the refund has been issued a confirmation email will be sent. Please allow an additional 5-7 days for the credit to appear on your account.

Shipping & delivery
To ensure a fast and safe delivery we use FedEx, DHL, Ontrac, USPS, & UPS Ground/Air shipping services. Available shipping methods may vary for different type of products and shipping destinations. Most products in stock ship same day, or within 1 business day after which its delivery can be tracked via tracking number sent to your email. For custom or made to order items shipping time varies as they may have to be manufactured, painted, embroidered, or assembled.

Please keep the following in mind:

  • Products that are oversized must ship truck freight / LTL which differs from ground shipments. NOTE: These oversized items require inspection and a signature upon delivery. For more information on freight shipping click here.
  • Shipments to Canada are treated as all other international shipments. It is the recipient's responsibility to pay all applicable duties, taxes, & brokerage fees. Detailed Info can be found here here.
  • Shipments to HI, AK, PR, Guam, Virgin Islands, APOs, & Canada might require extra shipping charges. International shipping quotes will be e-mailed to the customer before the credit card is charged.
  • Oversized items such as hoods, body kits, bumpers, tonneau covers, roofs, trunks and spoilers may require additional postage that is not displayed on the website. You will be contacted prior to the item shipping to confirm.

To request an international shipping quote before placing an orderIf you would like special shipping arrangements, please contact us via live chat, email or call us at 1.855.998.8726

Disclaimer
In effort to provide our valued clients with the most up to date and accurate information, JM Auto Racing is continuously implementing real-time updates to our online superstore. Due to the immediate nature of these updates the correction of any errors and/or omissions can happen at any time without prior notice. This information may include but is not limited to pricing, availability, suggested use, fitment, compatibility, and warranties.

JM Auto Racing is not responsible for any additional charges, labor, loss, or damage incurred as a result of information, correct or incorrect, referenced or products purchased from JM Auto Racing. While we work to avoid any errors or omissions that may appear on the JM Auto Racing website, we do reserve the right to cancel any undelivered orders based on inaccurate information. more details

Additional Info

GrimmSpeed was founded in 2006 to provide customers with innovative and highly engineered aftermarket products. On a more personal level, we are a group car enthusiasts who are working our passions in the lovely city of Minneapolis, Minnesota. Our bread and butter started out anything Subaru. However, after growing our team and engineering expertise, we started developing products for Mitsubishi, Ford, MazdaSpeed, and Hyundai markets. We are a true garage start-up (single stall townhouse garage in Maplewood, Minnesota) and we've been lucky enough over the years to be able to turn it into exactly the business we had dreamed....actually, much more. We have a wide breadth of product offerings including; intercoolers, exhausts, intakes, gaskets, engine pulleys, phenolic spacers, boost controllers, and many more.

Most of our decisions at GrimmSpeed are based on 3 basic principles:

1. Innovation

My team knows that if they propose a project to me there has to be at least one new innovative feature. It may be a completely new idea or an innovation to a current product on the market. We truly love creating products that really work. 

2. Keeping Jobs in Minnesota

Lets face it, manufacturing in the US has been lost for a long time. It's sad because manufacturing is what this great country was founded on. Our goal is to do our part in bringing it back to the US. Lets show the rest of the world that we do still 'have it'. Almost all of our partners are right here in Minnesota, most of which are within an hour of us.  Its not always about the $ and we are here to prove that.

3. Customer Service You Deserve

What flies for customer service these days just continues to astonish us. I don't have to tell you guys, I'm sure you are all well aware of some of the terrible customer service that goes on these days, especially in our industry. Our goals are to be honest with you, if something is going to be delayed, we aren't going to give you some made up date when it will be ready....we will tell you exactly the most current info we have. If you need help installing our products we will be there on the phone or email ready to help until you have figured out the issue. Last but not least, we will keep our word.  Plain and simple, if we say we are going to do something, we will.

JM AUTO RACING carries a wide range of performance auto parts, as well as car accessories and truck accessories. Whether it be body styling such as body kits, hoods, trunks, splitters, spoilers, and carbon fiber items; performance auto parts and car accessories such as turbo kits, superchargers, intakes, exhaust systems, cam gears, clutches and flywheels; suspension accessories such as coilovers, shocks, struts, springs, sway and strut bars, alignment kits and tie bars; or lighting accessories such as projector and euro headlights, HID kits, bumper lights, taillights, brake lights and undercar lighting, JM AUTO RACING has it all. Don't see what you're looking for No problem. Give us a call or send us an email because chances are JM AUTO RACING has the items in stock.

Warranty

What is the GrimmSpeed Limited Lifetime Warranty Policy 

GrimmSpeed-branded products are warrantied to the original owner against manufacturing defects in materials and workmanship for the lifetime of the product.

If a GrimmSpeed-branded product covered by this warranty fails due to a manufacturing defect we will repair the product, without charge, or replace it, at our discretion. Only original, unaltered and unmodified materials and workmanship are covered by this policy and you must provide proof of original purchase to be fully covered. This warranty does not cover damage caused by accidents, improper care/installation, negligence, reasonable/normal wear and tear, or the natural breakdown of colors, coatings and materials over extended time and usage. GrimmSpeed cannot be held liable for any damage to your vehicle and/or its components caused by failures associated with the previous statement. Damage not covered under warranty may be considered for repair for a reasonable rate or a reduced price for a replacement piece (a fee will be charged for return shipping).

This warranty is available in the United States and Canada.

This warranty does not cover products sold by GrimmSpeed that are not GrimmSpeed-branded products.

This warranty gives you specific legal rights; you may have other rights, which vary from state to state.

The GrimmSpeed website sells GrimmSpeed-branded discontinued, special make-up, and slightly blemished products at significant discounts as 'factory seconds' products. This warranty does not necessarily cover any products purchased as 'factory seconds'. The GrimmSpeed Warranty Department may repair 'factory seconds' products for a reasonable charge and a fee will be charged for return shipping.

Is normal wear and tear covered

The GrimmSpeed Limited Lifetime Warranty covers manufacturing defects in materials and workmanship, but it does not cover normal wear and tear over extended time and usage. Wear and tear is damage that naturally and inevitably occurs as a result of normal use. Regardless of how carefully you use, or how well you care for your GrimmSpeed product, like all performance parts it will eventually begin to show age and wear. Common examples of wear and tear that would not be covered under the limited lifetime warranty include denting, abrasions or scratches, color changing from heat in exhaust components and so on, less common examples include flex-section wear and fatigue cracks over an extended period of time.

How do I send my product in for warranty

The first step is to contact [email protected] and let them know of your issues/concerns. From there, a customer service representative will personally work with you to determine the best path forward. For the quickest service, please include your contact information and photos of the failed product along with a copy of your receipt/invoice in your initial email.

Upon request from your customer service representative, your product must be returned directly to The GrimmSpeed Warranty Department at 650 Taft St NE, Suite 300, Minneapolis, MN, 55413. All shipping to Warranty must be pre-paid and insured. GrimmSpeed cannot be liable for lost in-bound packages.

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