Yea, you need the lightest wheels possible, 30% fuel will help (but will decline engine life), lightest driveshafts (traxxas made some new steel ones, a very good deal, and these may actually have a heavier weight, BUT the rotating mass is less becuase they are thinner), and a lighter flywheel, just try to get parts that have a lighter rotating mass, gears, wheels etc. Also check out www.jdcarbon.com for some cool carbon fiber, light and really strong