K&N to 6637 Questions - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 04-29-2010, 05:31 PM Thread Starter
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K&N to 6637 Questions

Well my truck had this K&N intake on it when I bought the truck. I hear everybody talking about how much better the DIY kit w/6637 filter is. Anyway I was wondering if it were possible for me to just throw a 6637 filter on the K&N system? Or are there some contradictions you guys would know of?

Early 99 F250 Super Cab 4x4, 7.3L w/155k, Leveling Kit, 20" Fuel Hostages, 35" Trail Grapplers, TW 6 Pos Chip, Triple gauge pod, K&N Intake w/6637 Filter, 4" Turbo Back to 5" RBP Black Tip, 09 Seats, Console, and tailights, 05 Turn Signal Mirrors, Headlights w/6000k HIDs, Badges and Grille.
1979 Ford Bronco, 400m w/C6, Twin Stick NP205, 35" KM2's, Lockers.

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post #2 of 4 Old 04-29-2010, 05:45 PM
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buy a 6637 filter, worse case scenario, it doesnt fit and you have to get a 4 inch piece of exhaust pipe to make it fit. k&n makes great filters but there not for high compression diesels, the let too much fine particulate in.

2016 F450 6.7L XLT 4x4Dump, bone stock
1994 F250 7.3L XLT 4x4 ZF5 , Centurion, 4" Lift, 6637, Gulf Coast Bypass Filter, Big fuel tanks, dana 60 swap, No longer dually
1997 F350 7.3L XLT 4x4Dump, E4OD, 4 in exhaust, TS 6 position, 3/8 Trans line+external filter
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post #3 of 4 Old 04-29-2010, 07:10 PM
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You can run a K&N the stock type K&N filters were the bad thing in the OBS trucks just cause they didn't seal right I mean cmon they use k&n filters in all kinds of race setups even Baja trucks use them and the stuff they do is dusty if your worried about it buy a outerwear to put on it end of story, But if you do want to go with the 6637 like said before might just have to get a 4" piece of pipe can't go wrong either way in my book. I personally have had my K&N cone filter since I bought the truck new and have 154k on it now and see now pitting or dirt or dust in the intake tube and I drive in prety dusty conditions and out on sand dunes a bit.

2001 Crew Cab, Auto
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post #4 of 4 Old 04-29-2010, 07:18 PM
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A 6637 fits in the K&N kit.

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
Waiting to be installed: Electric fuel with A1000 pump and Stealth DIY Dual HPOPs
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