I'm new to the thumpertalk forums so please bear with me. Just bought an 05 525 MXC and the thing backfires like some gang banger in a street fight. I live in Parker, Colorado at about 6,000 feet altitude. Dealer did not change stock jetting and tells me now, "oh, you need to jet the bike for this altitude." To which I responded, "hey buddy, thanks a lot for the great set-up on the bike, what was I paying retail price for?" Any ideas on the jetting for this altitude?? Could this be some other problem? And, did I hurt the bike by riding the heck out of it anyway and putting up with the backfiring for 2 fairly long rides? Hope not! Thanks!