I've seen endless posts about all the free mods to do on these bikes, but never witnessed a before/after ride. My '04 WR450 was bone stock when I bought it, and it was a DOG! I have it for sale, so I thought I would do the free mods just to help the performance. I cut the gray wire, throttle stop, and air box. I also uncorked the exhaust. This is a totally different bike! Before, my '98 WR400 would smoke this thing, but now it's a close race. If the bike wasn't so damn tall I would keep it, but I already have my '98 lowered and shaved to fit me. If anyone's interested, $3,500 bucks will make it yours. Pics are in the FOR SALE Forum. PM me for info. Thanks to everyone for all the posts about the free mods. It's amazing that 1-1/2 hours of work and $0.00 changed the bike completely.