Quote:
Originally Posted by red-beard
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.
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I didn't realize we were talking about carbureted cars?
I can give you a specific example where a K&N cone filter is a significant improvement over a stock factory airbox.
1985 and older Buick Grand National/T-type turbos. The factory airbox simply cannot flow the kind of air required when you make just a couple modifications to the vehicle.
What's more, a cone filter facilitates the use of aftermarket cold air induction systems, which do make a difference.
So, while they are to a large degree marketing creations, K&N's (or more specifically, large cones) have their place.