I've got the k&n panel filter, just the drop in to replace the OEM. I really like it. I know a lot use the full cold air conversion however I've always been hesitant about them because of possible water injeston. The only real complaints Ive head about the k&n in general is some say they get oil on their mass air flow sensor. I've used them for years on several different vehicles and never had the first issue. When cleaning you don't soak them in the oil, just give it a coating and make sure to not over treat them.