Andy, I use a Dynamic 8" with a 4.10 gear and a 28" tire. I think the combo is real good for street/strip unless you do a lot of long distance driving. My car with the 511 also runs about 60-105 in 3 seconds judging by my video timer. Couple days ago on the freeway I checked it again with full exhaust at 5.5 seconds from 55-117 using my speedo for mph and the video timer for time. My vert has since been recalibrated by Lenny and seems a little tighter. It used to be 6% slip and when I checked it last year was 4.5% tru the traps. The car drives real nice on the street and the trans temp barely goes above 180*.