I baught this air filter because the Chevrolet dealership that I am from was charging me somewhere between $20.00 to $28.00 to replace the air filter with an AC Delco one. This frustrated me so I decided to buy this filter. It says it increases horsepower and mileage, to be honest I have not noticed any major improvement in either one. This was not the reason for me purchasing this product however, I baught this from the stand point that I can clean it and reoil it and use it agian. The way I figure it pays for itself after two or three cleanings. I decided to give this a 4 star rating due to the fact when you decide to take this out and clean it you have to allow it time to air dry (which will take sometime). A piece of advice buy a regular air filter to run while this one dry's incase of an emergency or something and once the K&N is clean switch it back out put the back up back in the box and put it on a shelf in the garage for the next time you clean or as I stated earlier plan accordingly. Also this may or may not be worth noting but the filter is not quite as deep as the disposable ones. Thank you in taking the time to read my review I sure hope this helps.