K&N Air filter - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 11-03-2012, 09:10 AM Thread Starter
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K&N Air filter

Is the K&N filter that fits stock intake bad for the 7.3L Motors. I have a 2001 Excursion with a 7.3
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post #2 of 18 Old 11-03-2012, 09:58 AM
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jury's out on that one...i'd say yes.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 18 Old 11-03-2012, 10:25 AM
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Why is a K&N bad?

2003 F350 Crew Cab 7.3L
- AFE Stage III Intake
- 4" Exhaust
- Goose neck setup
- Billet Grill
- 3 gauge A-Arm Cluster (Trans Temp, Boost, Pyro)
- DP F8 Chip
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post #4 of 18 Old 11-03-2012, 11:13 AM
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there is a ton of threads on this... do a search and read what you find... in general, from what I've read, the drop in K&N filter that fits in the stock air box doesn't fit well, combined with the fact that the stock air box bail clips tend to break and not seal the filter in well enough, lets dirty air get past the filter, and dust the turbo/engine.

Personally, I think the Wix 6637 filter/DIY intake is the best filter for the dollars... takes about 15 minutes to remove the stock air box, and install the 6637 filter with adaptor pipe (which is nothing more than a 4 to 7" long pc of 4" OD exhaust pipe and a hose clamp) and offers great CFM's of air flow, over 2x, almost 3 times stock CFM. This is the first mod I'd do...

Greg

'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD

'00 F350 extcab, 9' utility bed, dually 221k

E'99 F250 extcab, S/Bed 211k

'00 Excursion Limited, 7.3PSD 281k

'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k

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post #5 of 18 Old 11-03-2012, 01:07 PM
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Oh I was more concerned with the filter itself. I have a nice cone K&N that replaced the stock.

2003 F350 Crew Cab 7.3L
- AFE Stage III Intake
- 4" Exhaust
- Goose neck setup
- Billet Grill
- 3 gauge A-Arm Cluster (Trans Temp, Boost, Pyro)
- DP F8 Chip
- Banks Big Head
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post #6 of 18 Old 11-03-2012, 02:17 PM
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K&N is for the track, to provide the lots of air. its not made for off road or even daily on road use, they don't filter fine particles out and will "dust" your motor in the right (or wrong ha) conditions.

2000 F250 7.3L EX.Cab Short Bed -05 Front end w/ HID's - Leveling shackles - Wicked wheel - Dipricol gauges - FORD AIS intake - Foil Delete - LINE-X Rockers - CCV dump - 315/70/17 BFG A/T with Eagle Alloy 197's - ELC w/ coolant filter and around the belt hose - PHP Hydra - Hpress oil x

On the way--
-Fusion front bumper - ATS 3" fender flares


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post #7 of 18 Old 11-03-2012, 02:38 PM
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Quote:
Originally Posted by chrispaine View Post
K&N is for the track, to provide the lots of air. its not made for off road or even daily on road use, they don't filter fine particles out and will "dust" your motor in the right (or wrong ha) conditions.
X2. This is exactly the way I see it. Also to add to it, a diesel does not regulate air consumption. This means the filter will likely have to filter 4x more air than the same driving in a gas engine. This much more air just means the maintenance would have to be the same amount more.

6637 gets my vote and is what is on my truck.

Lee

2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
6637 with custom intake pipe. TS Performance 6 position chip!
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post #8 of 18 Old 11-03-2012, 05:38 PM
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Just go with 6637 filter. Best mod I ever done it.

DP Tuner
Dieselsite Wicked Wheel II
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6637 DIY Intake
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post #9 of 18 Old 11-03-2012, 06:50 PM
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Quote:
Originally Posted by Wildfire532FB View Post
Why is a K&N bad?
Read my thread. Unbiased, real-life experience: The Truth About K&N Intakes


2001 7.3L
Pro Comp 6.5" Lift
Pro Comp 16x10 Alloys
35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
Tru-Cool Max
Dieselsite Coolant/Trans Filters
ISSPRO EV2 (Boost, EGT, Trans)
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post #10 of 18 Old 11-03-2012, 07:11 PM
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I put the Ford AIS in a few years ago, no regrets but it does cost a few bucks. I have yet the change the filter, the filterminder hasn't shown restriction but I might replace is soon just because. I should have got the weight of it new, I guess they can put of a few pounds of dirt!

2000 F250 7.3L EX.Cab Short Bed -05 Front end w/ HID's - Leveling shackles - Wicked wheel - Dipricol gauges - FORD AIS intake - Foil Delete - LINE-X Rockers - CCV dump - 315/70/17 BFG A/T with Eagle Alloy 197's - ELC w/ coolant filter and around the belt hose - PHP Hydra - Hpress oil x

On the way--
-Fusion front bumper - ATS 3" fender flares


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