2003 YZ250 mods questions

As to the pipe, it depends on the type of power you're looking for. Each design has its own characteristics.

You could probably have a port/polish job and head work for less $$ than the pipe and silencer, and I'm pretty sure you'd see more power gain with the porting.

Try this link for info:

http://www.ericgorr.com

Of course, porting doesn't look cool . . . ;)

The bikes stock exhaust system is really good, and you will not notice really anything with an aftermarket pipe, but if you choose a pipe, id go with the PC platinum/R304 silencer, you will notice more over rev but not enough to excite you. I deffinatly recommend a new air filter, I went with Twin Air. I put on frame guards to protect the frame from wearing, and a skid plate to protect the crankcase from harsh stones. If you want to go fast on it, get your suspension revalved, best performance increase I think.