6637 Replacement Cover - Red
Made to high standards, these covers are designed to extend the life of your air intake filter while also giving you a way to visually see the amount of dust collected. The covers work equally well on both oiled and non-oiled filter elements to prevent larger debris from prematurely reducing critical air flow to your engine.
Installation Note: Take care installed over filter elements with metal cages as a metal snag can tear your cover.
54 Reviews Hide Reviews Show Reviews
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Air cleaner
Great product
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Filter Cover
Great product.. Helps keep filter clean from big debris.
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Air filter cover
Looks great and washable the red looks good under the Hood
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RiffRaff Diesel 6637 Filter Cover
Nice addition to the 6637 filter. Doesn’t look very restrictive to me as other reviews had stated. Looks like water would shed right off of it. Very easy to install and yes, the thread from stitching will hang up on the mesh around filter if you have to pull it back off for any reason. Looks to be the same color as my new RiffRaff Billet Plenums. It’s not as bright over the Donaldson Blue. Looks good, would buy again.
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Good quality
Perfect for the filter
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Filter cover
Looks dope. No problems.
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Fits the Napa 6637 sir filter perfect
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Fit nicely
Nice tight fit and dressed up the filter but hoping it extends the life of the filter
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Logo 6637 cover
Well made cover. Fits my AFE Big Boost filter nicely . Red looks sharp with the red boost tubes of my Banks Technicooler.
