Quote:
Originally Posted by m21sniper
If the old one was causing a restriction. Which it may or may not be doing depending on the airbox in question.
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Your throttle causes much more restriction. In the old days, with a carb'd engine, a restricted filter would make your engine run rich. Fuel flow depended on volumetric flow and differential pressure. A dirty filter creates a lower absolute pressure for the same throttle position and the carb meters too much fuel.
But with a MAP and/or mass flow sensor in your intake, the computer calculates exactly how much fuel you need.
The only thing you can gain with less restriction is maximum wide open throttle horsepower. With a modern fuel injected engine, you cannot get an efficiency gain.
There is another issue with K&N filters. The lower restriction allows more dirt into the engine. My engine rebuilder on my 914/6 thinks that is the reason my rings/clylinders were worn out.