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.

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



, ,

Customer reviews

Rated 5 out of 5 stars
2 reviews
4 stars 0 0 %
3 stars 0 0 %
2 stars 0 0 %
1 star 0 0 %

2 reviews for MaxFlow Stage 1 Air Filter Upgrade Kit for Twin Cam® Style Cover

Add a review

Use one of the allowed file type: jpg,png.

    You may also like...