Originally Posted by jp2005
actually dynamics i have no idea were you have received your info from, but i myself have removed the rear two cats, and installed straight pipes and installed a flowmaster. and the car does gain i would estimate approx 5 rwhp. i was very impressed. i've never heard anyone claim to lose hp from taking off cats, especially when their were 4 to begin with.
Actually you didn't read my post correctly, straight pipes will not cause airflow problems, I said if you gut the cat without sleaving them you will be creating an expansion area, which can cause bogging...