I put on an aftermarket tip on my exhaust because it had rusted quite a bit. There was some sort of extension put on the original tip so the new diameter was 2.5 so the only tip I found was this fatty 4" one. It had a built in resonator, but that didn't give it too much sound of course. It had been on for several months through rain and snow and looks great for $30. I bought mine at Autozone, and if you don't care about increasing HP, sound, an expensive replacement, or a factory replacement, just go with one of these.