Awesome product. I do not know why Ford did not use these as a factory item. Although my car is blown, with cams, 410s, LT headers, etc. These things make my car move and accelerate like a high priced foreign sports car. Immediate response from throttle. No lag between 2-3k like before. As soon as you push the throttle under normal driving conditions; cars moves!!You dont even want to talk about punching it at a standstill. Waste of tire rubber with my set up. It changed the exhaust note at idle too. I have a really good tuner, but I noticed that my digital MPG reader on my dash on highway went from averaging 37-40 to 42 mpg!! Kind of feels like going from 355s to 410s.