Ive done a few mods to my xr4. 58/158 jets.k&n filter.billet exhaust tip & arrestor.lots of black plastic(still need new seat & side panels)custom dual sprt kit(made myself).src fork brack & guards.acerbis hand guards & triple tree mounts for guards.aluminum bars.1" bar risers.xr's only chain guide. I've gone insane on this bike & still want more! this is almost out of hand!! NOT.