I've owned my WR for about five years and it's had an aftermarket exhaust system for the entire time. I've repacked it a few times but it's always loud and I'm finally fed up with it. What would be the best exhaust from 98-08 Yamaha YZ/WR to make work on this bike? I can modify mounts if needed. I think I can come up with the stock 99 pipe, but is there a better stock option?