I just replaced a few things on my 02 WR426 and took it for a ride yesterday, and all I have to say is I have the best bike in the world! I put in the 03 YZ exhaust cam so I could get auto-decompression and remove the compression lever. I added a Dr.D Hotstart lever as well. And I replaced the stock exhaust system with a complete FMF system - Power Core 4 silencer and Power Bomb header. I couldn't be happier. There's a noticeable increase in snap from the bottom end as well as in the higher RPM's, and the power just delivers quicker all around. The auto-decompression is taking a little getting used to...with the old setup (the decomp lever) there was a little trick to starting the bike. That trick doesn't seem to work anymore, but just kicking it hard like a 2 smoker doesn't seem to work either. I'm trying to discover the new trick, but on the whole it definitely starts WAY easier. I did a couple dead engine hare and hound style starts with my brother and beat 'em every time (he has a magic button even). The hotstart lever is a must. I still have an issue stalling it out occasionally and the hotstart lever has saved me a TON of time. I'm extremely pleased, and can't wait for my next race. I'll report on it - and I expect a top 10! Now all I need is a new subframe.