I just want to tell fellow Powerstroke owners about Power-Struck. Got a set of 180/100's installed by them this past weekend and the power and response is awesome. Shifting is perfect! Live tuning, you couldn't ask for any better! And their tunes are the best I have had to date. And I've had several tunes from different tuners. Customer service is outstanding! Gotta give them a call and try them out or at least look them up. You won't be disappointed.