Enjoy your Bagger More with a Zip Kit- Our Quiet Power Zip Kit includes a trifecta of improvements that transform your bike to a smoother, cooler and more powerful Harley® without drowning out your sound system. Our high flow air filter lets it breathe, our ThunderMax® with Wave Tune assures a perfect tune and our Khrome Werks Power Headers with 4" HP-Plus® mufflers provide great power with perfect tone. Zip Kits are delivered pre-mapped and ready for installation, with no dyno tuning required. Install. Ride. Smile.