Last wkend an 07 attack with airbox mod and fuel controller got 123mph on gps running with 22/38 gearing reving 10700rpm. A buddy also tested his 06 apex comparing 23/38 and 22/38 gearing and found that the 22/38 was better everywhere! Better acceleration and backship vs 23/38. Also sleds with 1" hacksaws with 96 studs vs 1.25 ripsaw have a 2 length advantage out of the gate on all conditions except really loose snow conditions. Sleds were various apexes/attacks with airbox mods and fuel controllers. One sled was a new 2011, dead stock, and it was the slowest of the bunch.