I got my K&N air filter today, but it's raining here so I will have to test drive later. I hope I can tell a little difference. I had the engine remapped and was told to get a K&N to finish off the remap. If I'm not happy I am going to a Power Commander and try it. With just the remap i couldn't tell that I gained much power. But the guy guaranteed his work and a credit towards a Power Commander if not happy.