6637 Replacement Cover - Blue

Part Number:



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

40 Reviews Hide Reviews Show Reviews

  • 4
    6637 cover

    Posted by Greg on Dec 23rd 2019

    Wears well (it does wear). Wish the ends closed up tighter but for a product that endures heat, dirt, and constant vibration it's worth it.

  • 5
    Perfect fit

    Posted by Patrick Devine on Nov 20th 2018

    Love it! Keeps the junk off my 6637

  • 5
    If you use the 6637 filter this is a must

    Posted by Unknown on Sep 19th 2018

    I have loved my Riffraff DIY 6637 since the day I installed it. This is the best prefilter sock I have seen. My air filter lasts so much longer and when I do decide to change the filter it still looks clean. Just wash the sock, hang dryer and bam. The filter ain't cheap so use the sock. I bought a second to trade out when I'm waiting for the other. Thanks Riffraff you have real products that I actually need.

  • 5
    Looks great.

    Posted by Jose ayala on Feb 28th 2018

    Love the way it looks. I just got it so i will see how it holds up. But love the way it looks.

  • 5
    Great quality and look

    Posted by Unknown on Feb 15th 2018

    The material is top notch and fit perfectly. Looks mean.

  • 5
    Great looking and fitting product

    Posted by Unknown on Feb 12th 2018

    Looks great in the engine bay and the fit was great

  • 4
    Beautiful and well made!

    Posted by Wade on Apr 25th 2017

    Looks great and fits perfectly.

  • 5

    Posted by Unknown on Feb 27th 2017

    Great looks...great quality and does what it's supposed to do. Logo looks EXCELLENT.

  • 5
    Looks great !

    Posted by Unknown on Nov 4th 2016

    If it works half as well as it looks it's all good !!