Agency Power Unequal Length Header Subaru WRX / STI 2002-2014

Agency Power

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The all new Agency Power stainless steel unequal length header kit is now available for your Subaru. A special designed collector enables perfect flow into the uppipe providing faster turbo spool and increased horsepower. The AP header features polished 304 stainless steel for a show quality finish. The header has CNC machined ½ inch thick flanges and includes everything you need to bolt directly on to your turbo Subaru. Installing the header will not only gain you about 15 wheel horsepower, it will also change the tone of your Boxer engine to a deeper and more aggressive sound.

Agency Power offers their unequal length header with or without their uppipe. Maximum gains can be found with their performance uppipe.

  • Note:
  • Head to uppipe gasket supplied

Fitment: 02-14 WRX/ 04-14 STi

Part #: AP-GDA-175


9 customers have reviewed this product.

Awesome Parts.

, Oct 30, 2013
So minus an up pipe, I am all Agency Power on my exhaust system. 2012 WRX. This piece went on beautifully with no problems. Just make sure to get an 02 wrench before doing it, as well as quality gaskets. Loving the new sound. Would recommend it!


, Feb 27, 2013
Bought these bought a year ago along with invidia catless catback exhaust. These were very easy to install. The headers split in half in case of fitting issues... herd when headers are like these you will have to weld em together because of exhaust leak over time.. Not in this case... took em to a muffler shop and the tech told me no need for them to be welded because of the tight fitment. Amazing sound and performance! Best bang for your buck!

Great Bang for Your Buck!

, Nov 21, 2011
Header was great build / performance quality ... no fitment issues .. even packaged well to avoid damage during transit. Very nice piece without killing your wallet. Best part is 2 bolt flange will allow you to mate up to a rotated kit.

Awesome product!

, Nov 16, 2011
Fitment was perfect! Not overly happy with the Gaskets that they come with...Blew out within 5000 miles...But header/uppipe combo is awesome!! Very happy!


, Sep 8, 2011
2011 WRX fitment perfect ! quality workmanship! thanks IIR and friends in Indiana who know Subaru's

Awesome Header

, Sep 5, 2011
Overall this is a great header and up pipe combo. I can't really say for sure what kind of extra power I made with it because It was installed with many other parts. But I did make 370WHP on 93 octane with and AMR CXR500 turbo and other supporting mods. Only downside to the combo is the Gasket it comes with, Buy an OEM style gasket with your purchase of this header for safety. The one it came with blew out on the first pull I did. Great header and UP pipe though!


, Sep 4, 2011
perfect fit you can feel the change !
Agency Power is quality Stuff. thanks IIR and freinds in Indiana who know Subaru's


, Aug 31, 2011
Awesome header no issues installing on 11 wrx .quality stuff!

Great Product!

, Jul 24, 2011
Fitment is perfect, sounds great, car making over 400+whp!

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You're reviewing: Agency Power Unequal Length Header Subaru WRX / STI 2002-2014