Well I tried to get the k5 inspected but they failed it because the muffler had a hole in it. So I went next door to the muffler shop and paid 200 dollars for a 10 series flowmaster and tailpipe w/ echo tip. My question is the muffler is not that loud. If I go to a high flow cat will that make it louder. I'm under the impression that it will but I just wanted yalls opinion.