If I could sum up the popularity of the Foxbody in one word, That word would be "versatility." They're probobly the most customizable car on the road even to this day!
The Fox probably ran longer than any other body style, and there were a ton of the made. The market for after market accessories/replacement parts is practically unlimited. There's a million different spoilers, air dams, hoods, headlights, tail lights, seats, even door handles and trim pieces. I imagine there are probably 10 different options to customize every last nut, bolt, and screw of a Foxbody Mustang. Don't even get me started on the options for the engine and suspension.
Leave it original, or make a totaly custom street rod. You can build a hard core track only race car. While most of the race variants end up as drag strip cars you can also build them into one hell of a road course racer.
LX, GT, Cobra from the factory. Roush, Saleen, Shelby, Cervini, all with their own take on everything from a chin spoiler to the rear wing. It's amazing the custom options for a Foxbody Mustang!