GrimmSpeed 04-21 Subaru STI Unequal Length Exhaust Header
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:
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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
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4-into-1 Low-Angle Merge Cast Collector - Ensures minimal restriction and maximum performance
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Smooth, Restriction-Free Flow Throughout – Single piece mandrel bent tubing welded to a single piece merge collector removes unwanted “steps”
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Substantial Power/Torque Gains - +25hp and +25ft/lbs of torque over stock
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Quickest Spooling Aftermarket Header - Faster spool and more power compared to the competition
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No Tune Required – Safe to run, just bolt on
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Gaskets and Hardware Included – Everything you need for installation to get on the road
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Designed To Fit With Aftermarket Oil Pans - Fits with the STI oil pan or popular aftermarket options
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Full 304 Stainless Steel Construction - 1/2" flanges and 14 gauge runners for extreme durability
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Manufactured and Welded In The USA – For consistency and top quality control
FITMENTS: *unconfirmed, may require further modification
- 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)
