I have only been able to run 10.7's with the 5 speed. Launching is very sensitive and in my case is still more luck than skill in getting good 60' times. The manual trans takes a long time to shift gears compaired to the automatic. If the manual trans takes .1 sec/shift longer than the auto trans, that's .3 sec in a 1/4 mile which is huge. Also, the manual trans does not like shifting above 7000RPMs because the syncros will not allow for smooth engagement.