richard- i have the rustler. got it about 3 years ago tho, so its kinda out dated, but its still a piss. the only mod i would reccomend is thicker shock fluid, thats all i did. i run it on 20% nitro fuel and it does about 35 on the street (or so they say) one major thing is that if you begin to have trouble starting, change the glow plug. they go bad pretty quick and once they do, trying to start it is like pissing into the wind. i would reccomend setting up a little tool box (allens, screwdrivers, spare bodyclips, a couple extra glowplugs, etc.) it really comes in handy when your out and it breaks (and believe me, they do tend to eat parts :-D. good luck!
mike