The gearing is not that different between the transmissions and in my opinion does not justify giving up the strength of the B15/P11. They share the same final drive but the B13/B14 does offer a very very slightly longer 1st & 2nd gear. This gearing difference could easily be made up using a taller tire. If you are having traction issues, learn to control your right foot or look at a wider, stickier tire.rooster said:is it difficult, i know there not as strong but i would have it beefed up. The gearing for turbo charged cars is just ridiculously short..
I would definitely try a larger tire size before giving up the strength of the P11 trans.rooster said:my biggest problem with grip is in 1st and 2nd gear the other gears are fine...u think maybe a 225/45/17 would be better?