Quote (Morphmcmanerson @ 9 Feb 2013 19:51)
adds downforce at high speeds.
I know what a spoiler does..
Quote (OldAndyAndTheSea @ 9 Feb 2013 19:51)
Without proper aero and wind tunnel testing it is impossible to accurately say how much it "helps or hurts"
I picked hurt, because
Your friend will never drive that car fast enough to possibly make that spoiler produce enough downforce for a noticeable gain. Especially not in a daily driving situation.
Agreed.
Not to mention if you look at a stock car, they use a duck fin design and not some over bearing goddy crap. I think it's pointless but he insist his car is going to be a rally racer.