Harley® Fat Boy features an air-cooled Twin Cam 103™ Harley engine with six-speed Cruise Drive. Extremely low mileage and I just don't have the time to ride it any longer. Several upgrades that are listed below:- Arlen Ness Stage II Big Sucker Air Filter- Arlen Ness Scalloped Black Billet Stage 2 Air Cleaner Outer Cover Big Sucker- Vance and Hines Short Shots Staggered Black- Dynojet Power Commander V