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Old 09-14-2016, 11:33 PM
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Rezarf Rezarf is offline
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Default K&N Air Filters

Need a new filter for the 100, any reasons to NOT run a K&N? I'm wondering between our dust, dirt and Utah silt if a reusable filter is an advantage or just good marketing hype?
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Old 09-15-2016, 07:09 AM
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DaveInDenver DaveInDenver is offline
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I ran a drop-in K&N in the '91 and noticed more dust in the intake tube. Went back to the stock Toyota. I'm not sure I trust the K&N. YMMV. In applications like Red Chili with the pre-filter foam over the cone maybe they are better, couldn't say.
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Old 09-15-2016, 09:02 AM
Firetacoma Firetacoma is offline
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Not K&N, but I ran a TRD reusable air filter on my old '99 Tacoma and got a LOT of oil and dirt gumming up my MAF sensor.
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Old 09-15-2016, 09:12 AM
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I had to replace the MAF on a 4Runner due to gumming up after using K&N filter. Never again.
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Old 09-15-2016, 10:13 AM
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Used the K&N for a couple of years and found more dust inside the 62's intake tube than stock paper or oiled foam. for the 100 I plan on sticking with the OEM.
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Old 09-15-2016, 10:59 AM
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AxleIke AxleIke is offline
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Same. Got a dry filter for the 4runner, but it was so loud I got rid of it and went back to stock.

KandN gummed up the MAF in a year and let in a ton of dust. No bueno.

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Old 09-15-2016, 11:25 AM
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coloradobound coloradobound is offline
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I run afe dry media. Filters well and no oil to gum things up.

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Old 09-15-2016, 11:36 AM
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TheHoneyBadger TheHoneyBadger is offline
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The Red Chili no longer has that bulky foam pre-filter. But it seemed to work ok? Squishy! should chime in on wether or not he's noticed a difference now.

I ran a K&N for years without a pre-filter. I wasn't really happy with the dust situation. So I ordered a light weight pre-filter from K&N for my specific filter size. I think it was $15. But it's definitely worth it. It catches all the dust and what not. It's easier to clean and cuts down on the need to clean the actual filter so often.
Now this is of course on a cold air intake with a cone filter. Factory intake boxes with the square filters are a whole other deal.
Before I went to the cone filter I did run a K&N in my factory intake box. But I didn't run it long enough before I switched to really know how it worked.
I never looked for them, but there may be pre-filters for the square drop in filters. If there are, definitely get one.
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Old 09-15-2016, 11:40 AM
SteveH SteveH is offline
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I loathe cleaning K+N filters (don't want to run oil into my septic system, and cleaning them with cold water in the yard with a garden hose doesn't work). Also, many rants against them in the Ford Powerstroke world - turbo 'dusting' due to dirt passing through.

I would get a Denso from Rock Auto (cheap) and run with that.
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Colo Springs, CO
'78 FJ40, '89 FJ62, '98 4Runner
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Old 09-15-2016, 12:14 PM
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Corbet Corbet is offline
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biggest problem is over oiling them. I ran one in my old Dodge Ram 1500 and it was great. I got better MPG and noticed more power. Subaru Turbo no difference.

In the cruiser I only run OEM as everyone knows on MUD, failing to do so will cause the end of the world.
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Last edited by Corbet; 09-15-2016 at 12:57 PM.
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