Long and the short of it my right catalytic converter is F*cked. Its disintegrated on the inside from heat and is bouncing around like a rag doll inside. my question is i know there is a sleeve on the muffler side but what about the down pipe??? my other question is does the A4 have a post cat O2 sensor that will be raising hell if i pull the entire system and run straight pipe unless i retune the ECU. and my last question who the heck makes a aftermarket stainless cat-back exhaust for a 1997 2.8L i swear the only kinda A4 i cant find a kit for.