I took a chance and ran a shorter slick with my car, and it paid off big time...
I went from a 26x9 m/t to a 24.5x8 m/t - no loss of traction, best my old best 60' from 1.83 to 1.74 and my old best 12.80 to a 12.56!
My mph is almost 2 slower, but that was mineshaft air I had in december...