What size pipes do you have? A BUZZNG sound usaly means a leak... That can also cause it to be raspy. If I were you I would get a high flow cat. And if that does not make anything better, then get a different resinator... I have a flowmaster 30 series with a 2 1/2" inlet and 3" outlet, with 2 1/2" pipes from the cat back, and my car is not raspy at all, and its nice and deep and when I stomp on it.. Lets just say I can set off a car alarm from a block away (with a D16Z6). And when I want it to be quiet, I just lay off the gas. In my opinion its the best sounding exhaust I have heard on a 4 banger. And it was not even meant for the car..