well uhhh

is there any downside to cat and related emissions removal on s4 tII? ( besides extra noise, smell and the environment )

GT34

Check with your local emissions laws first. Because there aren't any downsides to the removal of the stock cat and pipes. I'm sure in the states you'll have to get a catback in order to pass emissions, but that's way better than sucking through the stock cat straw. Plus bigger pipes ( from what I've hear racebeat's the best) does nothing but let the wankle and turbo breath better. There is nothing but good from removing the stock cat and exaust systems. Do it right now, stop reading this now and go get rid of it!!