What is the size of the stock exhaust piping? A sharp rock put a huge hole (bout 1.5 inches wide) in the bottom of my muffler and it sounds like crap, and so I'm looking to replace it. What size inlet should I be looking for? Is 2 1/4" or 2 1/2 ok? I was thinking of replacing it with a sweet-sounding Borla muffler (specifically, the XR1 Sportsman) but the smallest inlet that those come in are 2 1/2". Any comments or help?