A 3 speed holds the record but the 4 speed's have provern to be faster than the 6 speed auto's My 4 speed GT ran a 11.5 with Nos only and a mate of mine with a 6 speed BF and 40 rwklw more after 6+ attemps has a best of 11.6,me personally I wouldnt want a 6 speed only the fact that the gearstick itself has a lot firmer feel and less travel than the 4 speed CYA JEFF