Show me a car that you can modify and get amazing results for cheaper than what you can do with a Mustang.
They are simple to work on.
There is an absolutley HUGE aftermarket, more than any other car out there.
With the right combo of
suspension/power upgrades, they will walk anything and for cheaper.
They are incredibly light (and nimble) when set up right.
While the styling cues may not be everyones taste, they certainly look a lot better than Camaros (my opinion) and they don't have the stigma of being a "Gino" car.
Show me a stock car that is as fun to drive as a 5 speed, stock fox in comparable years and pricing.
A stock fox doing low 14s in the quarter is still faster than 90% of the import cars out there. Price of a stock fox that does 14s in decent shape? 5k. Price of a Mazda Speed6 that does 14s? 30k +.
I dunno...what else do you want.