Everyone has said that the WS2 is almost a stock sound until you go WOT. It's suppose to open up nice with a nice low grumble. I think it's almost like stock. Pipe size is pretty small but haven't found anyone to confirm what the stock pipe size is. The only thing about that exhaust that keeps me thinking about buying or not, is that my body kit has an oval cut-out for the exhaust, so I put an oval tip on the muffler I put on it, so it looks sexy and clean.. so I kind of don't want to change to a regular round tip, and wondering if the new exhaust would sit directly in the center of that cut-out.