Which 6637 filter

yogr · Feb 3, 2019

I was going to order a new air filter and I noticed that riffraff sells a white 6637 and a blue 6637 that is supposedly made of a better quality material.

I was wondering what everyone's opinion was on the blue filter, and if it's worth the extra cost.

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Gnathv · Feb 3, 2019

Yes it’s worth the extra, noticeably more cfm.

lincolnlocker · Feb 4, 2019

The white one will filter better and flows enough air on a 7.3 to make plenty of power unless you are shooting for well over 500hp. The blue one is a "high flow" version that if you live in any sort of dusty conditions, it will dust your turbo.

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yogr · Feb 4, 2019

Thanks for the replies guys, it looks like I'll stick with the white one for now as I'm completely stock other than a tune.

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Bugman · Feb 4, 2019

If you want a better filter than the 6637 google up Donaldson B085011. The Donaldson was what was first used as a open air filter on these trucks and is a better filter than the NAPA 6637 and if you look around you can find it cheaper.

lincolnlocker · Feb 4, 2019

Bugman said:
If you want a better filter than the 6637 google up Donaldson B085011. The Donaldson was what was first used as a open air filter on these trucks and is a better filter than the NAPA 6637 and if you look around you can find it cheaper.

Only thing different is the Donaldson is hydrophobic... which is a big plus. Same filtration and flow though.

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