My first K&N. I'll probably have one on any new vehicle I buy from here on out. Easy installation. Adds a much needed, aggressive sound while accelerating. Helps a hemi sound like a hemi should. Definitely feels more responsive when stepping on the gasgas too. Not sure about gas mileage improvement but haven't really tried to keep an eye out for that since I drive like a moron and I really don't care about gas mileage or I would have just bought a Jetta.