I can confirm that the AA headers is a TRUE equal length header, I installed a set of Fabspeed and it was not as good fitment as the AA, the O2 sensor placement is different slightly too.
I put 420whp on my Level 1 gen 7 kit, and when I finished Shaxx's car above he put 520whp. Both on same dyno. Before my car only put 396whp. This is both on same dyno.
What setup are you running????
If you'd like more info or want to talk about some options give me a call I'd be glad to help you out.
Note where 02 sensor placements are, fabspeed bank 2 is right at the collector which is at the exit. AP has it placed a bit higher up, and AA being the highest - actually mimicing the factory setup so readings are calibrated to the ECU's parameters.
I am not sure if required but the flanges are quick thick on Fabspeed...sometimes those thick flanges require a swap to E36 exhaust manifold studs and nuts as theyre longer.
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