I bought an '01 WR 426 with an aftermarket pipe that was way to loud. Since then I bought a used stock pipe to put on, that I believe was off of an '03 450. When I look at the schematics on bikebandit it shows an insert that goes in the end (pea shooter?) for the '05, but not the '03. My question is this: Does the '03 exhaust use the same tip? Has anyone tried to make one? If so, what diameter is the inside pipe. Looking at the picture, it looks pretty simple. Am I missing something? Thanks in advance.