I took my air cleaner cover off yesterday to clean and recharge the filter and noticed the rubber had torn away on the outer surface, at the bottom. Although I realized this probably would not have an affect on the filter or performance I decided to contact K&N as they offer a lifetime warranty. Today I received an email telling me to expect a replacement filter in a couple days. This kind of service is uncommon in these times. Hats off to K&N. i've used them in the past and will continue to in the future .