Originally Posted by justpoet

I just took a drill to the chassis and put lots of holes in it to lighten it. I managed to get down to about 4 lbs after drilling almost every part. It is really hard to drill out the center of drive shafts, getting straight enough of a shot is just annoying.
Then I got to figuring that if I just need to remove material, I should make parts thinner too. So I got out a file and took the chassis to half thickness, I even got to smooth out the bottom from all the 8th scale rocks I'd been hitting.

After also cutting out holes for most of the body, I was still able to put on a big wing in the back and some air splitters up front to come in at just under 4lbs.

Oh, and don't forget the most important part, carbon fibre pistons. Weight savings and more responsiveness due to meshing with the oil and emulsifying the carbon into the silicon to make the oil even lighter too!