I just got a dynomouth setup put on today and its sounds good untill you hit about 2500 then it has a crack to it kinda like a truck with cherry bombs. I think where I went wrong is I had a cutout right behind the Y pipe where the cat used to be and I replaced the cutout with this 18 inch bullet. should I have put the bullet further back on the pipe to get rid of the cracking sound or is this just something I have to deal with?? I have heard other dynomouths and they dont have the crack like that. oh I also have mac midlenghts and no cat on my car. one thing is for sure it is LOUD!!!