Put simple, this is the easiest Jeep CRD upgrade you can do. Simply remove the disposable air filter and replace it with this Jeep CRD upgrade filter by K&N; there is NEVER any cutting or fitting required. Our K&N stock replacement air filters for the Jeep CRD come with a 1 Million mile limited warranty. You'll never have to buy another replacement air filter again. This Jeep CRD upgrade filter gives you More Power and Better Economy.