Exhaust gas smells fine, no blackness of the tailpipe,and the pipe is new from the header back. This suggestion came from the 190 Revolution site... The trans mount might be bad. When I pushed up on the trans mount the trans visablely moved. One of the guys over there said that this actually caused his pipe to crack where the cat would have been. My local dealership does not have a five gas, and most of the shops don't either. We don't have emission checks here... yet. However the car is to loud with out the cat and taking it off is still tampering.