Boyesen Power X-Wing CV Carburetor Insert for Harley 88-06 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