Fits all fuel injected Harley-Davidson® Sportster® motorcycles.  One of HPI’s newest products and the only Sportster® throttle body upgrade on the market, this unit allows for more airflow over the stock 45mm throttle body.  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 8-10hp depending on other build modifications.  51mm and 55mm throttle body sizes available with hand ported intake runner diameters for 1.620 and 1.710 dimensions.

*Black anodize available for additional $150 and 1 week lead time.


Part # Diameter Intake Runner Cost $
HPI-51S1-62 51mm 1.620 $740.00
HPI-51S1-17 51mm 1.710 $740.00
HPI-55S1-62 55mm 1.620 $740.00
HPI-55S1-17 55mm 1.710 $740.00


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