Picked up an 04 STI from a car dealership in Brooklyn, NY. Now it has a front mount, up/down pipes and full exhaust. I bought the car like that so im not really sure what else it has. When i give it half-full throttle the car seems like it bogs and loses power. The service dept told me it needed to be tuned and thats the reason its doing it. A guy at the show room tried telling me the cars supposed to be like that (full of crap). The place told me they were gonnna tune it but never did cause i got the car back and its doing the same thing with the check engine like coming on for a misfire in cyl 3. Anybody have any ideas?