my good friend with a 350hp+ wrx double clutches his while he races, and i can tell you riding with him before n after he mastered it, its a good thing if you do it right... basically what he does is bang the clutch twice, feather the gas in between as in hit clutch, let out, hit gas, push in let out.... the trick is to get the timing down so that your making the shift at the right time.. its complicated especially in road racing while your bodys being tugged around by gravity and centrivical forces... but in my humble opinion it helps
course i have an atx so i just smash the gas :P
