[1] ZIPPER’S MAXFlow Stage I air cleaner upgrade kit includes a specially designed, washable, pleated fabric filter made from multiple layers of surgical-quality cotton gauze material that traps dirt while providing increased flow. The element, which is 5⁄8in deeper than the factory performance filter it is designed to replace, is said to yield over 60 percent more surface area than the Stage I filter. The kit includes required longer mounting hardware.

One version of the kit has been designed for use on Twin Cam engines equipped with H-D Screamin’ Eagle Stage I air cleaner and the standard Twin Cam cover, which makes 360-degree contact between the cover back and the rubber gasket on the filter.

A second option is an upgrade kit for Evo style covers. While similar to the Twin Cam version, this option is designed with the filter tapering outward towards the air filter cover, allowing use of 8in diameter EV-style round covers. It can be used on Evolution or Twin Cam engines if the appropriate EV-style cover is used. The specially designed 7in outer diameter filter is said to increase air flow while reducing intake turbulence.

ZIPPER’S PERFORMANCE PRODUCTS
Elkridge, Maryland, USA

www.zippersperformance.com