Riffraff Diesel 6637 Replacement Filter

Part Number:
RDPFILTER

Manufacturer:

$67.11
$48.64
(You save $18.47 )

Riffraff Diesel 6637 Replacement Intake Filter for Ford 7.3L 94-03

We suggest buying them in quantities of 2 as your shipping won't increase much and you will save money.

100% Made in USA

Write a Review

154 Reviews Hide Reviews Show Reviews

  • 5
    Works awesome!

    Posted by Unknown on Jun 1st 2015

    Running over 400hp through mine. Works awesome!

  • 4
    air flow

    Posted by Unknown on May 3rd 2015

    Thought it would help on fuel economy haven't seen much difference and less whistle but looks awesome with the cover

  • 5
    as advertised

    Posted by Unknown on Apr 27th 2015

    Have not been able to see if can improve performance but it seems to work well.

  • 5
    big filter

    Posted by jpc on Apr 22nd 2015

    I Have been running this filter for some time. I always get it from riffraff. Not only do they have it for the best price but they are timely on shipping.

  • 4
    filter flows very well definitely recommend it

    Posted by rebelford.psd on Apr 22nd 2015

    This fister flows plenty of air my old one i couldn't build more than 15 psi now im up to 22 only complaint i have is how big it is but i guess its the sacrifice you have to make forgood filtration and goid flow

  • 4
    excellent product, wish it was cleanable/reusable

    Posted by Unknown on Apr 4th 2015

    Since installing this on my 1994.5 7.3 powerstroke, my higheay mileage went from 17-18 to a steady 21 (unloaded.) My truck is a five speed with 4.10 gearing and thats running right at 65 mph turning roughly 2250 rpms. Highly reccomended

  • 5
    NAPA 6637 Air Filter

    Posted by Tim Hallam on Mar 30th 2015

    Great product. Excellent air flow. Increased my gas mileage 1.5 miles to the gallon. Bought a second for my dads truck. Much cheaper than a complete cold air intake system and doing just a good.

  • 5
    best filter

    Posted by Unknown on Mar 23rd 2015

    Love this filter so simple unlike all the other setups out there

  • 5
    6637 filter

    Posted by Kevo on Mar 14th 2015

    Excellent product looks great feel the diffrence from stock