I have a 2002 WR 426 that is for the most part bone stock (I've added a few cosmetics, ACERBIS handguards, UNI Filter, plastic...). I have been riding my whole life and raced motocross when I was younger. Growing up I didn't pay much attention to aftermarket mods; I just rode. I will be entering the AHSC series this year with this bike. A few years ago I raced an AHSC race on a DR 250 but at 5'11 205lbs I needed a bigger bike and also needed to get in better shape. After taking up mtn biking and dropping about 15lbs I'm ready to try it again. This is what I'd like to know: Can any of you enduro/harescramble guys tell me what I need to do to this bike before racing it. I will be ordering an exhaust system soon, and am looking at a White Bros. E-series S-Bend with the tapered head pipe. Is this a good system? Any ideas would be greatly appreciated. PS-Nothing too fancy please; I am on a budget.