Boyesen Power X-Ring - PX-BFI-47

Patented air vane requires no modifications to install
Acceleration gains from idle to wide-open throttle
Dyno tests show 2-5 horsepower gains and 4-6 ft.-lbs. max torque increases on OEM H-D engines
Independent tests were conducted on 88in, 96in and 110in engines
Complements popular air filter system upgrades
Made in the USA