QUOTE(sww914 @ Jul 27 2007, 10:27 AM)
I put a K&N in all of my cars. Why? It's not so I can get an extra 90 HP for $50.00. It's because paper filters are $12.00-$20.00, for the price of 3 I can get a K&N and never have to buy another filter. I haven't had any problems with them, ever.
In yet another edition of my anti-K&N marketing rant, I beg to differ with you. There's a TON of information available describing actual scientific tests, performed on real test equipment, done with controls, that show little or no HP improvement vs. stock paper filters. The number of square inches of filter media is FAR fewer in a K&N, the pores are larger, and they depend on proper, frequent cleaning and oiling to maintain even the most remote resemblance to the effectiveness of stock filtration. Think of it. Less filter area, more air flow. How do they achieve that? BIGGER PORES in the material! TANSTAAFL. YOU may think you have more power, but it's more likely to be the combination of a lighter wallet, justification for the expenditure, and an increased noise level. Hey, if it's louder, it has to be faster/more powerful, right?
I once counted the pleats in a stock 2 litre paper air filter, and extrapolated the square inches. Did the same for the K&N. I forget the exact numbers, but the paper filter had something over TWICE the filter area. If I had both here again, I'd refigure the numbers and write it up. Maybe someone would like to help out, here, and figure it out for a K&N. I'll do the stock unit and we can get a figure. Volunteers?
Last, but certainly not least, while you're painstakingly (and properly) cleaning and servicing your K&N, I've dropped in a new OE filter and have about a half hour to relax and enjoy a couple of adult beverages with my friends. The Cap'n