Described by Indianapolis based Horsepower Inc. as the only Sportster throttle body upgrade on the market, their 51mm and 55mm throttle bodies fit all fuel-injected Sportsters and deliver improved airflow over the stock 48mm item.
The kit includes a Billet-Pro air cleaner equipped with a K&N lifetime warranty air filter element (carbon fiber cover sold separately).
Designed to improve horsepower gains between 8-10 hp, depending on other build modifications, they feature hand-ported intake runner diameters for 1.620 and 1.710 dimensions for both 51mm and 55mm throttle bodies.
HORSEPOWER INC
www.horsepowerinc.net