After 120,000 miles my car drives like it is brand new. Don told me that I would have this experience after adjusting the valves and replacing the spark plugs, but I didn't really expect to notice a difference. I thought the car was driving normally. Wow, I had forgotten how it drove when it was new in 2006. It is totally noticable. Both smoother and more powerful acceleration. I love it! Thank you for exceeding my already high expectations for your work.