View Full Version : 6637 air filter

06-01-2011, 02:23 AM
Has anyone put a 6637 air filter on their Powerstroke? The clamps on my stock air box have broken. It has broken where the medal clamps fasten to the air box. I was thinking of just putting a 6637 filter on it instead of finding a stock air box.

06-01-2011, 02:20 PM
Very easy to do. You can follow these steps: http://www.powerstroke.org/forum/7-3-mod-help/4413-diy-intake.html

06-01-2011, 02:25 PM
do it. the filter from fleetfilter, a 45* elbow and a clamp from home depot only ran me about $10 more than a stock Motorfcraft replacement filter.

06-01-2011, 03:44 PM
I only needed a 6" piece of 4" exhaust tubing and a clamp to do mine. I think the early 99 and OBS trucks need the 45* part. Riffraff sells filters for $29 and 'full kits' with adpater, clamps, filter & cover for $77.

I do recommend the Filter Cover, it will make fliter last longer and offers some protection against moisture.

IMO, the best filter for a 7.3 is the Ford AIS system. For about $200 you get the best air filtration possible (except maybe AFE 7 - megabucks!) and enough air flow for well over 400HP.

06-01-2011, 03:44 PM
It looks easy. The worst part looks like getting the old air box out of the truck. I went ahead and ordered a filter and one of Pete's Prefilter covers for it.

07-26-2011, 03:17 AM
One down side is that the filter is just out there exposed to the same environment as everything else in the engine compartment. I've read in other forums that having the filter exposed in the engine compartment can expose it to excess moisture, allowing mold to grow on the filter.

NAPA and Donaldson makes filters that are treated for high moisture environments like marine applications.

The standard filters are..
NAPA 6637 (http://www.napafilters.com/filterlookup/PartDetail.asp?Part=6637)
Donaldson B085011 (https://dynamic.donaldson.com/webc/WebStore/search/item_detail.html?item=14043)

The moisture resistant filters are...
NAPA 2326 (http://www.napafilters.com/filterlookup/PartDetail.asp?Part=2326)
Donaldson B085046 (https://dynamic.donaldson.com/webc/WebStore/search/item_detail.html?item=14069)

07-27-2011, 03:58 PM
There are a must for the 6637 mod IMHO.

Easy to wash and makes the filter last much longer- plus look more finished under the hood.


08-23-2011, 09:46 AM
I just installed the AFE Big Boost from RiffRaff.
a few things to note.
I had to cut air box holder off. Basically everything from the back of the battery holder.

Its louder. Especially around 55-60 when the turbo isnt at full spin (that my ignorant assumption). Kinda sounds like the waste gate is stuck open or something. If im way off base let me know im new to diesels.

The AFE has very thin mesh for media support. Which is already damaged by rubbing on one of the tabs on the back of the battery holder. Granted im waiting for the filter cover to be sent as they didn't have blue instock. In the mean time i wrapped the filter in window screen and attached zip tie to hold it down until i get time to try something else. I am dealing with other issues too.

Was going to tack on to this post but IM not going to hyjack.

08-23-2011, 03:45 PM
There are a must for the 6637 mod IMHO.

Easy to wash and makes the filter last much longer- plus look more finished under the hood.


a 100-150 micron mesh bag from mcmaster does the same thing for less than $5. 2514K11 Well maybe not water repellant, but paper filters have been getting wet for years now with no major ill effects.

just would need to buy the right one that fits your filter, and a few of these http://www.staples.com/Staples-Small-Metal-Binder-Clips-3-4-size-with-3-8-Capacity/product_831594 to take up the slack.

Course those filter covers look a little nicer than a white fin mesh bag around your filter, but at $5 that leaves a bit of cash left in your pocket.

(except maybe AFE 7 - megabucks!)

you can buy the AFE 7 filter by itself for $70 to $90 depending on which model/size you want. I'll need to replace the Pro-guard 5 that is on my AFE stage 1 in a year or two as the rubber is starting to break down. I'll be spending the $70 on the Pro-Guard 7 filter when its time.