So I got some interesting results from a fun car I built. I built a block car, like out of the box looking block. slightly narrowed and height reduced. The body was hallowed out and than covered with a balsa sheet. I took the wheels and axles out of one of my SS's and started testing. Wow I can not believe the difference in time. Where the SS's was running 2.955's on my track the block was running 3.050's. I knew that aero mattered but I didn't think it would matter that much!