it will cost you just $1650 for the kit alone plus installation. A few mustangs around here have them and they look really cool, but in the end quite useless and costly. If you want to do it, take a look at the kits, but I think your money would be better spent on performance mods. :yes
I forgot to mention that they make your car awkward to get into and if you get into a decent crash they will probably have to cut you out. Anyway good luck.