6637 Replacement Cover - Red

Part Number:



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.

Write a Review

38 Reviews Hide Reviews Show Reviews

  • 5
    Fits well, breaths fantastic.

    Posted by Brian on Aug 3rd 2020

    Made a big difference in boost

  • 5
    Nice addition to all my other riffraff upgrades,a definite must have if your running the 6637

    Posted by Steven on Dec 31st 2019

    Affordable top shelf products,excellent service

  • 5
    Excellent Product

    Posted by James on Dec 10th 2019

    Excellent Price

  • 4
    What you'd expect.

    Posted by GW on Dec 9th 2019

    Bought this unsure of what I'd be receiving since I had seen pictures of Riffraff "bag-type" pre-filters with a drawstring on them, but the current picture on the website didn't confirm or deny that. This is instead very similar to a popular brand of pre-filters in that it has elastic at both ends. Only giving it four stars because I've always had issues with elastic-banded pre-filters. After a few removals for cleaning and the underhood heat, the elastic tends to break down and requires you to get creative with zip ties to keep it sealed to the air cleaner.

  • 5
    Good Cover

    Posted by Unknown on Aug 19th 2019

    Easy install obviously, looks like great quality cover.

  • 5
    6637 Cover

    Posted by D. Mo on Oct 26th 2018

    Ordered this product to cover the Donaldson Blue air filter in the 6637 kit.. as always Clay and his team deliver innovative and superior products!

  • 5
    Looks good and easy enough.

    Posted by Unknown on Aug 29th 2018

    Looks good and slid right over the filter no issues. Shipping was timely.

  • 5
    Cover 6637

    Posted by Schroeder on Apr 30th 2018

    Keeps 6637 clean, looks great.

  • 5
    Looks great

    Posted by Jay Z on Apr 3rd 2018

    Plug seems well made, and looks great