Ground effects Removal

Oh hell, they glued it on? Thats what happens when ricers get ahold of a mustang. They brutalize it.

You could try some chemicals that remove sticky stuff, such as goof off, but I doubt that will do it. If you have a heat gun try seeing if that will soften the crap, if it does then get it hot and it should come off. A soft scraper should be a valuable tool. If you have to, butcher the kit to get if off. That way it's off the car and it can't be used again to deface another mustang.

Without seeing exactly how it's attached (the epoxy used), it'd be hard to say, but you might be able to use a heat gun, and some sort of knife like you suggested to break the bond.

Grr... 5 minutes late on that one. That'll teach me to open up several windows at once! At least we're thinking on the same level