Is your bike already equipped with a factory Stage I performance air cleaner? Raise the level another step! Zipper’s MaxFlow Stage I Upgrade Kit includes a specially designed, 100% washable pleated fabric filter made from multiple layers of surgical-quality cotton gauze material that traps the smallest dirt particles while providing dramatic flow increases. The element is 5/8” deeper than the factory performance filter it is designed to replace yielding over 60% more surface area than the Stage I filter. These kits are designed with the filter tapering outward towards the air filter cover, allowing use of 8” diameter EV-style round covers. Takes about 5 minutes to install – the difference is immediately noticeable!

MaxFlow Stage 1 Air Filter Upgrade Kit can be used on Evolution® or Twin Cam® engines if the appropriate EV-style cover is used. Specially designed 7” O.D. filter increases air flow while reducing intake turbulence. Includes air filter and required mounting hardware. 7” end diameter at cover mating surface.

Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

Weight 1 lbs
Emissions Compliant

Country of Origin

Engine Type


Fuel / Air

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