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so I bought this car with the MANN filter, which has some weird soft stuff that actually helps prevent pollen and dust from entering air chamber. I just installed the K and N drop in air filter. I immediately see better results in performance and even gas mileage 3 mpg increase. Is there harm in using the K and N over the MANN that helps prevent more tiny particles from entering. Which is best to keep my car running smooth for the long run?
 

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Become informed. Learn to separate fact from butt dyno fiction. Don't read advertising copy as objective third party testing. Stay in school - don't do drugs. Oh yeah, and read this:

Air Filter Comparison Study - GM Truck Central
 
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Discussion Starter #3
SO the k n filter does let a lot of particles pass. This study did not include the MANN filter. You saying I should not use the K N filter anymore? I just bought it:(
 

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Throw that K&N where it belongs.

MANN is an OEM supplier of filters to GM and is respected.

AC Delco air filter is the one that most of us use.

Whatever you do, your car deserves a new filter.
 

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so I bought this car with the MANN filter, which has some weird soft stuff that actually helps prevent pollen and dust from entering air chamber. I just installed the K and N drop in air filter. I immediately see better results in performance and even gas mileage 3 mpg increase. Is there harm in using the K and N over the MANN that helps prevent more tiny particles from entering. Which is best to keep my car running smooth for the long run?
I noticed a 10-15F degree change in ambient temperature reduced my gas mileage significantly.
 

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Mann and Hengst both are known as high quality filters.

Only brands I would use on my Mercedes since I bought the first one.

Lesser quality filters let in more abrasive dirt and that WILL significantly increase top end engine wear over time.

Is a tiny bit of power worth losing 20-30k+ miles off the life of the engine?
 

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You will gain ZERO power/mileage with a different filter, due to the way the PCM controls boost from the turbo. Stick with the stock filter.
 

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SO the k n filter does let a lot of particles pass. This study did not include the MANN filter. You saying I should not use the K N filter anymore? I just bought it:(
because of the internet, every idea you can come up with, someone/many have thought/done the same thing and posted results, good or bad.

learn from them, spend 10 mins on the internet and save your money
 

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Discussion Starter #9
auto store only has the Purolator classic. Is this a good filter compared to other good filters? its only 15 bucks.
 

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Discussion Starter #10
and on that study the amsoil is the best. So is this the best filter amsoil? They have the best oil FYI
 

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Discussion Starter #11
walmart sells the FRAM filter is that any good? Im just trying to find a new airfilter that is good for my engine. Money dosent matter
 

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Buy an OEM AC Delco MANN filter...there is a reason it was selected over a Fram or Purolator.
 

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Does anyone know of a cheap pressure transducer 0-5v? I can hook two up on both sides of the air filter and log the voltages; then do WOT pulls with different filters. What we'll see is the pressure differential. Less is better, less restriction to drop pressure.

btw my torque PID calculates 220 ft-lbs, 265 hp (200 kW) so we'll have a better example as more air is pumping.
 

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Could just use a MAP sensor, or an automotive vacuum gauge with a long hose...I have no doubt that an oiled gauze filter will show less restriction...That isn't even up for debate...but it WILL let in more dirt. When you have a system that regulates boost, based on calculated engine torque output, a lower restriction filter won't make a HP difference. Only thing I could see it doing is slightly lowering charge air temps, since there would be a lower pressure differential between the inlet and outlet of the turbo.
 
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