I'm actually surprised by the 335 turning faster times than the previous IS-F. My IS-F feels tighter in the turns and faster on the straights then my map 7 JB3 335xi. Granted the awd adds some weight but I don't think the rwd and less weight would make that much of a difference but apparently it does. Butt dyno says the original is-f test was poorly driven. My 2 cents of inflated U.S. Currency!
2011 E89 Z4 Sdrive35i M tech