You are more than likely correct as little things like the Y pipe on the 06 STi is better than the 03 STi just because of the slight change in design. It allowed for better air flow & cooling across the entire Top Mount! The Japanese know their shite!
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Originally Posted by JA50N
I have done some extended research, and the STi inlet manifold has a greater flowing capacity than the WRX inlet manifold, and the 2 door STi inlet manifold has a even better flowing capacity than a 4 door STi one. My sources are from the head foreman of Subaru parts and servicing Australia and a Subaru building engineer via E-Mail in the USA. Just thought I'd point it out for anyone else that didn't know the difference, and is new helpful information to them.
So as the thread states, I would like to buy a STi inlet manifold if anyone has one for sale.
Thanks, Jason
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