Gotta ? for those K5 owners in Jersey. Went to upgrade my exhaust to single 3" with a hiflo cat and a Flowmaster series 50 3" center in and dual 2.25" out. Flowmaster also makes a y pipe to go from 2.25 to 3". All you need do is some short and relatively straight 3" work to hook up the y with the cat and the mod 50. Was ready to pull the trigger on this when a local mechanic friend said that no way would this setup pass the sniff inspection on the dyno. Anybody had any experience here? Thanks.