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post #1 of 28 Old 04-22-2011, 04:58 PM Thread Starter
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Napa 6637

Opinions on this filter, pros cons, i have a K&n cleanable filter, which is better?

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
Stage 2 TC, improved internals
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post #2 of 28 Old 04-22-2011, 06:42 PM
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IMHO, the 6637 is a better filter for our trucks, the K&N Brand was originally designed as a racing filter.

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"If you want smoke, work for it. These guys did" JJFLASH


Stormtrooper:: 1997 F-350 CC SRW PSD XLT 4X4: Baby Swamps, Wildman 4 pos chip, 120V IDM, SD Intercooler,BTS E4OD, RSK, CCV mod, shimmed FPR, DIY 6637 air filter, triple pillar pod with Isspro gauges, 4" MBRP exhaust, SD dual tensioner,
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post #3 of 28 Old 04-22-2011, 06:52 PM
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heard k&n lets to much air through and dusting motors letting to much dirt and such through, just average mods and changes the 6637 will be perfect

--->Zach<---

1996 CCLB, XLT PSD, 4x4,
Auto, Autometer Guages, Matts Tunes, Stage 1's, AIS Water/Meth, Intake/Intercooler,
D66, gutted EBPV, Built Tran. dual napa Tran. Cooler and . . . More
1995 Ranger XL 2.3L 2x4 More Photos -->Truck <--
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post #4 of 28 Old 04-22-2011, 07:11 PM Thread Starter
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sounds great, does the 6637 need any type of housing to sit in

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
Stage 2 TC, improved internals
Loudest, Proudest member of the Fightin' Texas Aggie Class of 2015!
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post #5 of 28 Old 04-22-2011, 10:20 PM
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nope you should be able to use your K&N tube too, just get rid of that motor dusting pos filter n toss it.
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post #6 of 28 Old 04-22-2011, 10:51 PM
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200K miles using 6637's, no problems, and will turn 352K this weekend.

Craig

Remember Ft. Hood

And never forget who did it

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post #7 of 28 Old 04-22-2011, 10:56 PM
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You can use the K&N tube and it works great! I had one layin around in a buddy's garage that he had taken off of his, it fits perfectly with my 6637! Go for it and never look back


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2007 F-350 CCLB XLT FX4 ZF6 08 Mirrors, CTS, Gearhead, BD EGR Delete, Coolant filter, B&W, Custom rear springs, still rockin the stock head bolts and clutch!


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post #8 of 28 Old 04-23-2011, 03:41 AM
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6637 all the way for me. Probably time to change mine after a year or so of abuse.

94.5 PSD Dually Crewcab F-350. Uglee, stock and reliable.
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post #9 of 28 Old 04-23-2011, 08:37 AM Thread Starter
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that was my next question, how long do they last, can i just knock the dust out and keep going for a little more, these filters are he same type that we use at a quarry on heavy equipment and they just blew the dust out with a air compressor and kept going, probably wouldn't do this to my truck. so a year is what people are getting out of the filter?

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
Stage 2 TC, improved internals
Loudest, Proudest member of the Fightin' Texas Aggie Class of 2015!
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post #10 of 28 Old 04-23-2011, 11:29 AM
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Depends on where you live and the conditions.

Up here in the rust belt we have road salt dust and all sorts of other nonsense (they're spraying the roads with some sort of liquid now...ain't nothing like the newfie shower you get from passing them). A year might be too long here but that's just how it worked out. Napa usually has sales on those filters so reckon it's time to see whazzup there.

94.5 PSD Dually Crewcab F-350. Uglee, stock and reliable.
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