Polini Bell Mouth Style Velocity Stack 50.5mm US30 they are built to withstand

they are built to withstand the elements while providing a premium look for any custom build

then you will need a optional axle spacer

The dual sided design will protect not only your levers from rider contact but also keep your hands protected during a crash

The track and power is our focus for exhaust systems

Polini Bell Mouth Style Velocity Stack 50.5mm US30 they are built to withstandNOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES Polini Bell Mouth Style Velocity Stack 50. 5mm, universal fit for any throttle body or carburetor with a 50. 5mm O. D. opening. For velocity stack filter screen wrap, please see CH 1318 Polini Velocity Stack for PWK carburetors. 50. 5mm inner diameter. Inner Diameter 50. 5mm Outer Diameter: 79mm Includes Set Screws Carburetor Not Included NOT LEGAL FOR SALE OR USE IN