K&N has always had an excellent reputation for their products, but they are expensive. A special offer made this reasonable. I plan to keep my vehicle for an extended period, so it will pay back for itself some time in the future. My filter is a little hard to examine, so I'm glad that I will not have to disassemble the air box as often. Beware if you have the vehicle serviced by others, the "grease monkeys" will be quick to rip it out and try to tell you it is bad and you need a "factory style" to replace it. Put the enclosed sticker on the air box and tell them to leave it alone! I have not used it long enough to measure any overall improvement in mileage or responsiveness, but the main reason was its reusability for almost an indefinite period. Make sure that it is the correct model to use for your application, as any misfit will cause damage to your system. I double checked on K&N's site, got the correct part number, and then ordered through Amazon. You will need to buy a "recharging kit" to clean and restore the filter in about 50,000 miles, so be prepared in a couple of years