On November 14th 2012, ZippersPerformance.com received a long overdue overhaul. Fans of Zipper's Performance Products and Harley-Davidson® performance enthusiasts can now take advantage of Zipper's 30+ years of performance excellence. On the new site, you can browse many of the ground-breaking performance solutions from Zipper's Performance including: Red Shift® Performance Cams, Red Shift® Cam Chain Tensioners, MaxFlow air filter kits, engine kits (like Zip Kits and Muscle Kits), and ThunderMax® EFI System products.