They work great but make sure you keep them clean. I let it go too long on my Cummins truck. it was getting hard to start and had a hard time pulling a load uphill. It runs great now that I've recharged the K & N. Gary ----- > > > I put a K&N on the Cherokee 3,000 mi ago. Checked > mpg today and it picked > up 1.7 (17.9-19.2). Them things work. Joe > >