Performance Shift just raises the shift pressures and shortens the shift times in the trans. It also enables the 3-1 and 4-2 skip-shift downshifts. Sadly there is no increase anywhere else in the system, no additional timing or anything


But, of racing I would suggest leaving it on the whole time, cause it also rases shift points,letting you get more out of every gear......

Thats All I got I sure others have more info about it