Not trying to sound disrespectful, but "oh hell no"
do I have to remind you you're driving a Mustang, not a truck (or an 80s Lincoln). Serriously, do you have any idea how hiddious cars are with rims that size, god it makes me want to puke, and not just me but any Mustang person.
Again, not bashing you, but that's just a god aweful thing to do a car. You're going to have mounting issues, as well as tread life issues, not to mention that if you hit a pot hole you're going to get an egg, and that doesn't even start to mention the MPG loss you're going to endure.
If you want to change your rims out go no larger than 18" (tires are more expensive that 17" though), they won't require any modifications, and most will look decent on a stang (talking customs here not Ford as most Fords look great), and you won't lose nearly as much power or MPG.
Seriously, DO NOT GO BIGGER THAN 18!!!!!!!!!!!!!!!
