Air filter question

[2000 7.3 6speed]

I have been looking in to making my own intake and every one says to use the napa filter 6637 and a have also herd the wix filter 46673 and from what i understand they are the same thing. so i went on fleetfilter.com which i herd about from the org. but what i don't understand is with the wix filter 46673 the CFM is 425 and the stock filters CFM is 640 and that don't make sense to me why would you want to put the bigger filter on if the stock one will let more air through? just a thought

[RadarRider]

Originally Posted by 2000 7.3 6speed

I have been looking in to making my own intake and every one says to use the napa filter 6637 and a have also herd the wix filter 46673 and from what i understand they are the same thing. so i went on fleetfilter.com which i herd about from the org. but what i don't understand is with the wix filter 46673 the CFM is 425 and the stock filters CFM is 640 and that don't make sense to me why would you want to put the bigger filter on if the stock one will let more air through? just a thought

2 great people that would have info on this is Dirk & JimTJr. PM them & see what they can say about the airflow for both filters.

[Hank]

I used to use a Baldwin filter of the same size. I found that it got squeezed between the hood, inner fender, battery and fuse box. I went to a tapered Amsoil filter and get a lot more air moving now. You can hear it!

Just my $0.02.

[losrocket]

I have the Napa 6637 filter and on throttle you can hear that baby suckin' air!

[sevenpointthree]

i also was getting ready to do this will it allow more air in does it make a difference

[Hank]

Originally Posted by sevenpointthree

i also was getting ready to do this will it allow more air in does it make a difference

Oh yeah, you bet!

[alabamafrog]

PART NUMBER: PA2818
Descriptions : Air Element
Replaces : Donaldson ECB085011
O.D. : 8 1/2 (215.9)
I.D. : 4 (101.6) One End
Length : 12 3/8 (314.3)

Here is a list of cross over numbers for most major manufactures for the same filter from the Baldwin website. You can also go to the Baldwin website and put your zip in to find local dealers.

ACDELCO A1474C

AIR REFINER ARM08-5011

BALDWIN FILTERS PA2818

BIG A 94637

CATERPILLAR 3I0003

CARQUEST 88637

CUMMINS 2912986

CUMMINS 3912020

DONALDSON B085011 H

DONALDSON ECBO85011 H

DONALDSON ECB085011 H

FLEETGUARD AH1141

FLEETRITE AHR81141

FRAM CA6818

GFF AF359214

GENERAL MOTORS CORP. 25177209

HASTINGS PREMIUM FILTERS AF2329

HERCULES B085008

KRALINATOR LA1458

LUBER-FINER LAF2533

NAPA GOLD 6637

SCHUPP SL12903

WIX 46637

WIX 546637

WOODGATE WGA1138

[alabamafrog]

Originally Posted by 2000 7.3 6speed

I have been looking in to making my own intake and every one says to use the napa filter 6637 and a have also herd the wix filter 46673 and from what i understand they are the same thing. so i went on fleetfilter.com which i herd about from the org. but what i don't understand is with the wix filter 46673 the CFM is 425 and the stock filters CFM is 640 and that don't make sense to me why would you want to put the bigger filter on if the stock one will let more air through? just a thought

46673 should be 46637

[RadarRider]

I should've gotten into this before I got my S&B. My S&B intake sounds real cool, gives me a slight seat-of-the-pants performance, & gave me 2 extra MPGs, but now there's snow on the ground & I'm just worried about the oil bath.

[alabamafrog]

To me the main reason to do the DIY is to protect the engine. The factory filter system leaked dust into mine and cost me an engine rebuild which was a lot of work and $$$.
It is just a nice benefit to get the increased air flow. As for the flow ratings of filters, I don’t know much about that but I do have some common sense that tells me more surface area = more flow at the same or tighter restriction. To me the only way to have more flow with less surface area is to sacrifice filtration.