wish i could remember the article i read, but it showed where prodriver (dnt rem who now) took a stock D8 outta the box and ran on a big open loose outdoor track...then took same motor and radio tray out and put it in a hara ed D8 w/all lightened parts and the end result was just a hair faster lap times and the heavy stock D8....sorry i cant reference the website i was on where i read that...but any how makes sense tho