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Old 08-28-2014, 09:59 PM   #1
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K&N vs Stock

So I did an impromptu, totally unscientific test this afternoon hat was quite revealing. Using an OBD adapter and a corresponding app, the MAF sensor reported a 4 g/s difference between the stock (20 g/s) and the K&N (16 g/s). I had already switched at this point as the thought of oil getting on the MAF from the K&N made me forever jump ship.

It's funny, when I put the K&N in it felt sluggish. I was still new to the car so I didn't put much thought in it but now going back to paper my car does seem snappier. Not earth shattering, but different (to the good).

Just a humble observation.

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Old 08-28-2014, 10:06 PM   #2
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Oh yeah, and this was at 3000 rpm.


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Old 08-29-2014, 09:30 AM   #3
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Your particular filter might have been over oiled, but regardless you won't really see any performance gain from a filter. It's just about convenience of being able to just wash out the filter rather than buying a new one.

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Old 08-29-2014, 09:52 AM   #4
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The only time MAF sensors get contaminated by oiled filters is when people clean them and over oil them. A lot of people have no idea how to clean a reusable filter.

I haven't heard of one person that has had a problem with it out of the box. It's always after they've cleaned it.

I've used them in literally every single one of my cars (about 10 cars) for the past 11 years and have never had a problem.

But yeah, the drop in isn't going to get you anything. There are even dynos showing the 3.7's losses with them, albeit only 2-3 hp.

I have one just for the convenience of it...and I actually know how to clean mine and not eff it up lol.
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Old 08-29-2014, 09:59 AM   #5
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I wish they made a reusable version of the cabin filter... seems like it wouldn't be hard to make one at all.

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Old 08-29-2014, 10:07 AM   #6
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Thanks for the input. Sorry, I didn't mean to imply my MAF had oil on it just that the possibility existed.

I know the performance gains/losses are negligible but every little bit helps!
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Old 08-29-2014, 03:00 PM   #7
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Put them side by side

You will notice that the stock filter has a lot more surface area then the K&N. I'm guessing they both let way more then enough air through for the engine to breath. To me it looks like the Ford filter will actually trap smaller particles without the use of oil and move more air.
I'm not a scientist but I think I do like to see why some things advertised do what they say they do. I'm with JoeyM91 when he say's:
Quote:
you won't really see any performance gain from a filter. It's just about convenience of being able to just wash out the filter rather than buying a new one.
I bought a K&N drop in when I first got my car and also notice a sluggishness with it in. I removed it and put the stock filter back in until I got my AIRAID. I bought the Airaid for EYE CANDY and sound. I know it does not do much else on a stock Mustang.
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Old 08-29-2014, 03:21 PM   #8
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Quote:
Originally Posted by ronnie948 View Post
You will notice that the stock filter has a lot more surface area then the K&N. I'm guessing they both let way more then enough air through for the engine to breath.

Ronnie

This.

Considering the 5.0 uses the same exact air filter as the 3.7, you've got to imagine it has the capacity to move way more than enough air.
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Old 08-29-2014, 04:38 PM   #9
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Very good point VIG


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Old 11-06-2014, 09:44 AM   #10
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Anyone try a green air filter.?



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Old 11-06-2014, 11:22 PM   #11
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I went a completely different route. Got a dry AFE cone style drop in filter and the airaid modular intake tube. I am really happy, no real data to support any claims of gains other than it sounds great and seems to work well with my 93R tune.

The way I look at it was $160 total for essentially the same (or very similar) thing as an airaid CAI at almost half the price.


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Old 11-07-2014, 12:51 AM   #12
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I've used k&n type filters before, but have never found removing, soaking, rinsing, drying, oiling, redrying, and reinstalling one to be in any way more 'convenient' than simply removing and replacing the paper filter...Especially when paper filters magically appear on my doorstep whenever I need them.
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Old 11-07-2014, 04:16 AM   #13
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Quote:
Originally Posted by ronnie948 View Post
You will notice that the stock filter has a lot more surface area then the K&N. I'm guessing they both let way more then enough air through for the engine to breath. To me it looks like the Ford filter will actually trap smaller particles without the use of oil and move more air.
I'm not a scientist but I think I do like to see why some things advertised do what they say they do. I'm with JoeyM91 when he say's:


I bought a K&N drop in when I first got my car and also notice a sluggishness with it in. I removed it and put the stock filter back in until I got my AIRAID. I bought the Airaid for EYE CANDY and sound. I know it does not do much else on a stock Mustang.
Ronnie
One dyno affiliated company actually showed a slight loss of power with the K&N filter over stock on a 5.0 equipped Mustang.

I'm a past user of K&N on my old Harley. I put well over 150K on one that was on my motorcycle, When I read that posting result about the Mustang, it made me realize that on some of the stock parts that came from Ford, you really can't do better than.
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Old 11-07-2014, 10:00 PM   #14
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There is absolutely no point in buying one for a street car. I had one on my ATV but it needed to get cleaned after every 2 rides since I loved mud and dirt so much. A street car only needs one every few years. Why risk it?
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Old 11-07-2014, 10:37 PM   #15
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If it made you feel better about your vehicle, there is nothing really to loose with a k&n. I've always on every vehicle I've ever had one on, which would be 3 cars and every motorcycle/atv I've ever owned, felt it helped a bit with throttle response and overall smoothness of the engine. I have heard bad things about the k&n cai for our cars so I would never buy one for my mustang but if I ever get another bike or quad, I wouldn't think twice.
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