If I had to make one complaint about the American Thunder kit, it's that you can't turn down the noise level when cops are following you all over town. That's happened to me twice in the past 24 hours. Once last night on my way to a baseball game, a cop followed me from just leaving my friend's house all the way to the stadium. And then this morning, four cops were departing from a little meeting about a mile from my house; one got in front of me and the other three behind me, all four were by me most of the way to work this morning.
But I suppose you'll have that problem with any exhaust kit...damn pigs.