[theMonster]

The driveshaft will reduce weight (slightly) and is stiffer (but not bendable) like the stock, however the extra weight of the batteries would most likely make this negligable. I'd concentrate on degreasing the bearings and slicking them up with some graphite or slick50 lube and then the motor (play around and see what works best), then lightening the car, trim off excess plastics with your dremel. If you want to get wild, hollow out all the unneeded mounting points and platic on the inside of the body and then glue your bumpers and groundfx on and use some super sculpey to fill in the lines...It'll take a lot of time, but you can end up with a mean machine!