Hey guys, I've had them on a week or so and I can really tell a difference in the heat coming off the exhaust. The mileage is about the same, maybe a little down, and I don't feel much difference in the power, maybe a little quicker throttle response. The plugs are burning cleaner though, and I really like not having so much heat rise up in my face. So, for a hundred bucks or so, I'll take it. Quick and easy install, took about 20 minutes.