HI,
I think this is who I was thinking of.....
Pipelyne Mfg
385 Lincoln Avenue
San Jose, CA 95126
(408) 279-2307
They may be a little far tho......
Also,
I was thinking....How long of a race were you guys planning (what type of terrain etc)?
If he is running stock and the terrain is fairly level (assuming you both have roughly the same power output since you said he was running stock)....Maybe you can suggest a longer run on flat terrain and use a smaller sprocket to win by gearing?.....his engine will be buzzing away w/ a 44T and you'll pull away from him!....(like running the Daytona 500 in Overdrive VS first gear).
I think that could be how you beat him without worrying about getting a pipe (NOTE: engines can only rev so high before they blow so even if could get the added power of a pipe it still wouldn't do too much good if your sitting there buzzing away in too low a gear).
Andrew