I've been using K&N air filters for some time now, this is the latest one for my new smart car and what a difference it makes, better performance driving hard or easy, it will have earned itself after the first 2 or 3 services, and you don't need to clean it that often either, I think the exhaust sounds much better too, I've also bought one for my Triumph motorcycle but haven't fit it yet, the K&N air filter I had in my last car which was a 2001 4.7 V8 Jeep Grand Cherokee made its performance incredible, I will never be without a K&N air/oil filter ever.
Raymond Smith
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Northwich, United Kingdom