GrimmSpeed Unequal Length EJ Header Subaru 04-21 STI, 02-14 WRX, 04-13 FXT, 05-09 LGT, 05-09 OBXT

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SKU grm113026

The GrimmSpeed Unequal Length Header for the EJ-Series engines is here. 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!

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.

Quick Specs

  • 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

Fitments

  • 04-21 Subaru STI
  • 08-14 Subaru WRX
  • 09-13 Subaru Forester XT*
  • 05-09 Subaru Legacy GT*
  • 05-09 Subaru Outback XT*
  • 02-05 Subaru WRX 5MT (Requires STI Oil Pan and Pickup)
  • 06-07 Subaru WRX (Requires STI Oil Cooler and Feed Pipe)
  • 04-08 Subaru Forester XT* (Requires STI Oil Pan, Pickup, and Oil Cooler)
  • 04-06 Subaru Baja XT* (Requires STI Oil Pan, Pickup, and Oil Cooler)

*Unconfirmed, may require further modification



Please note, there could be shipping delays due to popularity and scarcity of items for this model, but if it's in stock it will ship right away!

    The GrimmSpeed Unequal Length Header for the EJ-Series engines is here. 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!

    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.

    Quick Specs

    • 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

    Fitments

    • 04-21 Subaru STI
    • 08-14 Subaru WRX
    • 09-13 Subaru Forester XT*
    • 05-09 Subaru Legacy GT*
    • 05-09 Subaru Outback XT*
    • 02-05 Subaru WRX 5MT (Requires STI Oil Pan and Pickup)
    • 06-07 Subaru WRX (Requires STI Oil Cooler and Feed Pipe)
    • 04-08 Subaru Forester XT* (Requires STI Oil Pan, Pickup, and Oil Cooler)
    • 04-06 Subaru Baja XT* (Requires STI Oil Pan, Pickup, and Oil Cooler)

    *Unconfirmed, may require further modification

    

    Please note, there could be shipping delays due to popularity and scarcity of items for this model, but if it's in stock it will ship right away!


      This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov