Zipper's Parts & Accessories

Zipper's Performance have been doing serious V-twin R&D out of Elkridge, Maryland since 1981 — Red Shift cams, ThunderMax engine management, CNC-ported cylinder heads, big-bore kits, and driveline components, all developed in-house on their own dynos and at the drag strip. Coverage runs across Sportster, Dyna, Softail, Touring, and Milwaukee-Eight.

One of the sharpest catalogues in the Harley aftermarket, and the cam profiles in particular are what most independent tuners reach for first. Engineering depth that genuinely reflects four decades of V-twin development, not just rebadged parts.