I have them on my car (Granted V6) and the driving manors around town are nice so the cops won't mess with you but when you step on it like Charlie did in the video they scream. Also they don't drone and produce a very pleasant sound at WOT, I have gotten a lot of comments on my exhaust from everyone including many GT owners.
[ame=http://youtu.be/FMBlMcdAqXQ]Ford Racing GT500KR ( FR500S ) Exhaust on 2005 Mustang GT 23-Sep-11 - YouTube[/ame]