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Discussion Starter · #1 ·
I installed a K&N drop in air filter on my Frontier S. The old paper filter was rather dirty but on the clean spots you could definitely see light through. My Frontier now has a nice modest growl when accelerating mildly. I've had it for about 2 weeks - throttle response is much improved, fuel economy may be slightly worse. Automatic transmission seems to shift quicker, likely due to better throttle response.

So far I'm pleased. But if I worked at a rock quarry I'd put in an AC Delco. Since I don't work at a rock quarry, and drive on paved roads, 97% or so filtration instead of 99% is ok for me.
 

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Discussion Starter · #2 ·
Today I towed our trailer out to its winter storage building. This was the first time I towed it since getting the K&N air filter. I was impressed - I could accelerate up a hill quite nicely. I can only assume that by improving throttle response that it also helps the 5 speed auto transmission shift more efficiently.
 

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Sadly this is mostly just your imagination working overtime. Simply putting in a KN air filter wont give you any better airflow than your paper oem filter will below 5000rpm. Above 5000rpm you could possibly be getting an additional 2-3 HP which in no way you can detect without a dyno.This does prove how effective todays marketing industry is.
 

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Sadly this is mostly just your imagination working overtime. Simply putting in a KN air filter wont give you any better airflow than your paper oem filter will below 5000rpm. Above 5000rpm you could possibly be getting an additional 2-3 HP which in no way you can detect without a dyno.This does prove how effective todays marketing industry is.
If you walk through AutoZone/Summit/etc and bought every product that claimed performance guarantees, you'd have 2000 horsepower by the time you got home.
Better to spend the $$ on practical things that look good, sound good, feel good, function good rather than unmeasurable "performance" products. And you can easily go broke buying all of that practical stuff.
 

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My little motor spends 90% of it's life below 3000rpm, almost all of the hi-po hardware doesn't even start functioning well at that low of an rpm.But people have to rationalize spending the money so they buy the outrageous manftr claims.
 

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I installed a K&N drop in air filter on my Frontier S. The old paper filter was rather dirty but on the clean spots you could definitely see light through. My Frontier now has a nice modest growl when accelerating mildly. I've had it for about 2 weeks - throttle response is much improved, fuel economy may be slightly worse. Automatic transmission seems to shift quicker, likely due to better throttle response.

So far I'm pleased. But if I worked at a rock quarry I'd put in an AC Delco. Since I don't work at a rock quarry, and drive on paved roads, 97% or so filtration instead of 99% is ok for me.
I put the same in mine I was very happy too huge air filter
 

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Thanks guys. Guess no K&N for me on this vehicle. I'll be sticking to factory stock OEM filters.
 

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The major point of K&N is that you clean them, not dispose of them. I've been using them for well nigh 30 yrs now and put a new one in every vehicle I acquire. Ordered one for my wife's new-to-us 2012 RAV4 just yesterday. Had a $15.00 off $50.00 coupon for AutoZone so this K&N cost just double what the premium paper filters are, and will last the life of the vehicle, guaranteed.
 

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The
The major point of K&N is that you clean them, not dispose of them. I've been using them for well nigh 30 yrs now and put a new one in every vehicle I acquire. Ordered one for my wife's new-to-us 2012 RAV4 just yesterday. Had a $15.00 off $50.00 coupon for AutoZone so this K&N cost just double what the premium paper filters are, and will last the life of the vehicle, guaranteed.
The problem with K&N and similar cloth filters is that they let more dirt through them than conventional paper filters, which is the main purpose of having an air filter in the first place. It's all about compromise!
 
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Discussion Starter · #10 ·
Last week I had a P1010 [I think I'm remembering it right] code. I looked it up, one of the possibilities being a dirty MAF. I cleared the code and ordered a Fram filter for my 2.5 [could not get one locally]. Amazon came through fast, it arrived Sunday morning of all things. I pulled the K&N, installed the Fram. Cleared the code. So far so good.

A little quieter. A little easier to keep under 2500 rpm going from 4 way stop to the next 4 way stop. Other than that performance seems fine.

Will be interesting to keep tabs on my mpg.

I guess with the benefit of experience - if you want to pep up your Frontier, put in a new high quality filter. The improvement I noticed with the K&N way back when was likely going from dirty to clean.

There was a lot of dirt on the in side of the filter, including a bird feather and a lot of sand - we use sand as well as salt here for winter traction. Out side of the filter in the box was nice and clean. Both sides of the filter appeared clean - the sand feather etc. seemed to settle in the plastic housing before touching the filter. Gravity.
 

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Had you serviced it since installing it? They are not service-free, fwiw.

These 'things' seem to have two camps. I'll break it down to those who wish to filter their engine's air more vs those who wish to filter the air less.

Dry filter believer here.
 

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This is interesting.
K&N didn't score so well, I'm pretty disappointed personally as I've run these for decades. Looks like swap to AC Delco or Baldwin's in my near future.
 

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Discussion Starter · #13 ·
Had you serviced it since installing it? They are not service-free, fwiw.

These 'things' seem to have two camps. I'll break it down to those who wish to filter their engine's air more vs those who wish to filter the air less.

Dry filter believer here.
Was not serviced. Just the factory oiling, with less than 10,000 kms since installation.
 

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Discussion Starter · #14 ·
My theory is that something like a K&N may help performance if filter size is undersized compared to say engine displacement. In the case of a Frontier 2.5, likely a 4.0 and 3.8 as well, that is not the case. A tight filtering dry filter will still flow all the air the engine needs.
 

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I think your right, that 2.5 has a HUGE filter, can't imagine it's flow being restricted even when dirty.
 
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