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Fitment:
2004-2021 Subaru STI
2008-2014 Subaru WRX
2002-2005 Subaru WRX 5MT (Requires STI Oil Pan and Pickup)
2006-2007 Subaru WRX (Requires STI Oil Cooler and Feed Pipe)
Over the years, GrimmSpeed Engineers have proven that they are capable of manufacturing the highest quality, best performing exhaust components for the Subaru aftermarket. While they might not always be the first to release a certain product, their major advantage is that they can take their 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 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
Installation
Video - GrimmSpeed Unequal Length EJ Header - 04-21 STI, 02-14 WRX, etc
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As always with IIR parts came fast and packaged well. The GrimmSpeed headers themselves were very well made and fit perfectly
Now that I've had a couple of times driving with this thing I can review it. For starters...to no surprise, GrimmSpeed killed it with the quality. The moment you take it out of the box you'll notice that you got what you paid for. The flanges are THIQQQ and the welds are REAL PURTYYY. Overall build quality is amazing. Installation was a breeze ngl. My advice is to do it with a friend if you're using a lift cause it gets heavy after a while of holding it overhead. Also, loosen up the Up-Pipe a little to help with the installation.
In terms of the difference it made after installation, I did the Up-Pipe and header at the same time so I can't outright say the difference I felt was solely from the header, but I can say if u can do both at once definitely do it. For one it's just easier cause you're gonna be touching them either way but boy does she rip afterward. Turbski is definitely spooling quicker than before and she pushes you back in your seat.
In terms of sound, as many of the reviews online say, it sounds like it's flowing a lot better. For me, the idle seems way better and surprisingly mellow and the car does also have a slightly deeper tone. However, once you get on it, you better hold on and smile.
All in all, I'm super happy that I went with this header over the others and I'd do it again with no hesitation.
Love this header
