Personal in terms of looks, or speed? In the looks department there are a few choices: 17" wheels, lowering kits, headlight swaps, interior accessories. Graphics are another option, but are less popular among Mustang owners for various reasons.
As far as engine and performance mods, there is almost an endless list. Cold Air induction, lower rear-end gears, ported intakes, dual exhaust, superchargers, turbochargers, nitrous.....
Browse the gallery for ideas. The site is probably the best source of help on the net for mods to your car. Very nice people and knowledgable. Do your homework, though.
