Originally Posted by garagedefeat
'99 rs w/ maf and 2 filters intact.
a 2.5i was dyno'd on same day w. a cat-back - it bettered the 2.5i car by 14 whp and 20 wtq.
2.5i had afr's in the 12.2-12.5 range vs. 99 rs afr's at a pretty solid (and terrible) 11.3.
I was under the impression that this header was developed for '05 - previous models.. due to the different(tricky) exhaust routing and CAT placement on the 06'-07' model. I own an '06 2.5i. Do you offer a header/back-cat for the 2.5i with the afore mentioned "simple" (no fabricating/removing or relocating cat) installation?
Please forgive me if this has already been covered. I'm new to Subaru and am a noob as far as technical knowledge goes.