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. The kit includes required longer mounting hardware. 5-1/2” end diameter at cover mating surface. Takes about 5 minutes to install – the difference is immediately noticeable!

Note – This kit is designed to be used on Twin Cam® engines equipped with H-D® Screamin’ Eagle® Stage I air cleaner and the standard Twin Cam® “football” cover, which makes 360º contact between the cover back and the rubber gasket on the filter. Do not install decorative cover inserts (due to increased weight) or use with 2006-up CVO Touring model oval covers that do not make 360º contact between the cover back and the rubber gasket.

2008-up Dyna® models using the factory teardrop cover must also order cover gasket #150-591 to correctly support cover.


This product is not for sale or use on pollution controlled vehicles.

Weight 1 lbs
Emissions Compliant

Country of Origin

Engine Type


Fuel / Air



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