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my buddy owns a 2003 900 cat and has problems when he gets into deep powder. on the trail, it is fine and runs great, but as soon we jump off the trail it bogs down. I'm thinking the motor is getting starved by the snow and it cant breathe, so to speak. is there anybody else with this issue who fixed it and/or anyone with some insight or advice for him. Would prefilters be better than the air box or is there some way to cut vents so it can breathe? Or is this even the problem. It is completely stock. any help is much appreciated! THX