Just had a FactoryPro jet kit installed during my first service, and what a difference in behavior it made! No more popping on decceleration, no more 5 to 10 minute warm-ups, half-choke starts, and red-line comes at you a lot faster! I drove away from the shop on a back country road "touring pace" ride for about 130 miles; 45 to 65 mph, and filled up when the flashing light came on at a little over 190 miles. Here are the pieces I had used in my kit: Main - 175 front, 180 rear (recommended for aftermarket exhaust - "Wings") Pilot - from 42 to 45 Needles - supplied needles at recommended settings for sea level Air Screw - recommended settings for same at sea level The kit is pretty complete with various main sizes, and the cost was a little over $100. THIS qualifies to me as a VERY GOOD UPGRADE. Highly recommended! BTW, no canister-ectomy yet...surprised me when I didn't have any more popping when slowing down!