O.K. Well I just got my T5K kit from Toomey and it only came with two size mains, 280 and 270. I am suppossed to use the 270 for elevation above 3000 ft. I have no problem with that, but I want to get some advice. I am at almost 4200 ft and basic mods are wiesco .20 over, boysen reeds, unifilter with airbox on, pretty much stock. What size main do think I should run?? The kit also came with instructions to install airbox vents and the perfect jet kit, ect. Let me know what you guys think... Thanks