Mine are only 11's and there is still not enough room.

On a semi-related note: I know this is crazy stupid, but what about a hand control for the throttle?...as dumb as this sounds it first crossed my mind while I was trying to learn heal-toe techniques for rev matching while downshifting my other car (6 sp. manual) especially on a roadcourse. Instead of the gymnastics of footwork I figured let one foot do the brake, the other the clutch, and I can blip the throttle with my hand. I eventually learned decent heal-toe technique and that cleared my head of such ideas.