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This report presents the results of an ISO 5011 test of several air filters designed for the GM Duramax Diesel. The test was independently performed under controlled conditions using a $285,000 machine at Testand Corp of Rhode Island (manufacturer of the machine). Arlen Spicer

Read more: http://www.dieselbombers.com/chevy-gmc- ... sting.html

That's about what I expected to see. I am surprised Fram was not on the list.

Pugsley wrote:That's about what I expected to see. I am surprised Fram was not on the list.

me to -but then again fram might of sue them if they didnt like the results so they may of just left them off the list !

I am sure K&N is not happy either.

Looks like my Purolators don't do too well either. Oh well. Guess I'll start ordering and throwing in AC Delcos

Pretty much lines up with what I've seen on the Jeep forums I'm in. Everyone complains that they have dirt after their filter after an outing with K&N's.

K&Ns are OK on race cars or hot rods where they're rarely driven and dust isn't an issue but their claim to "power" assumes that your OEM filter is decreasing enough air to slow you down and that's highly questionable.

They can really mess up your MAF (mass air flow sensor). I was considering getting one for my vette, but on the vette forum they talked me out of doing it due to the potential damage to the MAF sensor if too much oil was used.

MAF sensors are cleanable and I even think K&N makes a cleaner for just such an occasion. No permanent damage is done. I ran one in my turbo Volvos for years, never had a problem with too much oil. My kid uses one too.
I do think the engines air supply will be less dusty with a stock filter and realistically, you won't notice a difference driving the car either way. With K&Ns, you might think it's faster because you're trying to justify the cost.

It's like spark plugs that claim to increase mileage and power vs OEM plugs, simply not realistic.
Then there's a product called water wetter to improve the engines cooling efficiency. They claim that ordinary coolant molecules don't flow well enough to remove heat from the engines cylinders and with water wetter, that's then improved. Oddly, I can't ever think of an instance where an engine failed from overheating using regular coolant (system full, no problems).

Large fortunes have been made selling snake oil to car owners. I find it amazing how much companies get for aftermarket performance items that produce little or no performance improvement. They are a self-fulfilling prophecy for the buyer - buy it, put it on, go drive the car and it "seems" to perform better. Even when there is objective evidence (if you can believe it) - it is often at the higher rpm ranges where most engines will become junk fairly quickly if thrashed at those speeds. I get a big kick out of expensive cold air intake kits - the performance gains you get from those is almost too small to measure - but every other kid under 25 has one on his vehicle.

I get a big kick out of expensive cold air intake kits

Yep, especially when the air is normally taken from outside the engine bay in the first place....thus "cold". Every Ricer has one of those worthless kits.

LOL Yeah but it makes an annoyingly loud noise when you floor it! Err...thats not a selling point?

This confirms my original thoughts. The more flow=the more dirt. The less flow=the less dirt. Find a happy medium, I suppose. Or like others said, you probably won't notice a difference either way. So buy the cheap ones and replace them more often.