Thread: K&N Air Filters
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Old 01-29-2013, 04:51 PM
ard ard is online now
Resident Curmudgeon
Location: Sierra foothills, California USA
Join Date: Jul 2009
Posts: 15,630
Mein Auto: '12 X5 35d/E39M5/996TTX50
Almost fell out of me chair!

Dont often get that kind of response.

Here is a thought:

As you can see from filter performance curves, the resistance of a filter goes up as it loads with dirt- hence, over a lifetime, your airflow is very good when new, and drops until you finally replace it.

My recommendation to people who are seeking the best airflow, would be to just replace the air filter more often! I do oil filters at 2x the BMW rate, and replace the air filter every other oil change. Easy Peasy. You'll always be on the 'good half' of the dirt loading curve!

Keep it as simple as possible...but no simpler.
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