Quote:
Originally Posted by HP Autowerks
AFE OE Replacement air filter for the BMW 328i F30 2012 L4-2.0L (t) N20. This filter is available in Pro 5R (P/N: 30-10225) and Pro DRY S (P/N: 31-10225). Constructed with 100% polyurethane, this high flow, OE replacement performance filter outflows the stock paper filter by 28% resulting in improved horsepower and torque.
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I see this "flow" figure thrown out a lot by filter manufacturers.
Does this mean a 28% increase in flowrate at the same pressure drop? What kind of pressure drop across the filter do you get at different air rates?