you should get a new pipe and header, like these....

http://www2.towerhobbies.com/cgi-bin...?&I=LXSP45&P=7

http://www2.towerhobbies.com/cgi-bin...?&I=LXBMH0&P=7

I have both and they work great, i like them alot. Also maybe new wheels and tires. and then it would be really cool if you got a wing, but thats just my thought, i think it would look cool,[sm=thumbs_up.gif]. then maybe some new shock towers like aluminum or carbon fiber. when i had my n-rusty, the first time i brought it to the track i broke the rear shock tower in less then 10 minutes, and that thing is lighter which means less stress on its so i think that some new shock towers would be good. so then you could have a pretty cool racing volcano, and i think that you could beat your cousins tmaxx, that would be really cool. but you could get like an extra 5 or so mph by just adding the pipe and header, and better accelaration. I dont know how serious you are about all the hop ups but thats what i would get. hope this helps