I’ve already read several reports on K&N air filters. Here’s my years of experience with K&N: In fact, it’s like the K&N keeps a life of car life, every now and then, of course. I can confirm the difference in optimized performance when accelerating, I drive a Harley with 1200 Kubik and here I drove paper, foam and also K&N. Clearly the K&N is the best filter here. We’ve already driven the following cars/motorcycle with K&N: VOLVO V7 0, Bj 99 approx.70,000 Km long VOLVO V70II Bj 2004 approx.125,000 Km long POLO 9N Bj 2004 approx.100,000 Km long VOLVO XC 60 Bj 2011 approx.50,000 Km long current vehicle Harley Bj 1993 approx.50,000 Km long current vehicle VOLVO C30 Bj 2011 approx.2,000 Km long current vehicle think that speaks for the K&N Gruss Phil