Had a 05 summit and just got a 09 summit x 163. Had it out for a little tear today and I really like it. Didn't take long in the ditch to see that a vent kit would be needed bad, the front just funnels the snow in. Never pushed it very hard, but noticed that it seemed to had a little bog some where in around 5-6 thousand. Is that just because it is new? hope we get some more snow and a guy can take it out for the day.