Just did it, reset the ECU and took it for a drive. Everyone is right, there is better throttle response and no wavering in power at highway speeds. It is barely audible when I drive it so the way my wife drives it, I'm sure she will never hear it. Now all I have to do is reset the windows. Install was simple and easily switched back for dealer visits should I be so inclined to swap. Oh, and I went w/ the blue spring by itself.