89-99 HARLEY FLSTC: Dynojet Stage 7 Thunderslide Jet Kit Stage 7 kits are for 80 plus horsepower engines and include a taller carburetor top for more slide movement. Revolutionary composite plastic slide provides unparalleled performance gains in both horsepower and mileage. Unique set of lift holes moderate how the slide moves with respect to throttle position; the faster the slide opens, the quicker the throttle response. Kits include jets, needles, clips, carburetor top and other necessary parts for CV carbs. Made in the U.S.A.