Work on the cosigner hard, as most car lots even buy here, pay here, die here lots will not sell you a V-8 stang due to your age (under 1 and no credit what soever. Have you checked insurance on a V-8 Mustang, might be higher then your monthly payments on the car. Not trying to be negative but hard when low on cash. Wait till tax time and try to sell yours at the same time. Not sure though how much you will get back though. You need to figure it out to make sure its not only a couple of hundred dollars. 87-90 are usually found for as low as a 1000 to avg about 2500 for a driver to 3500-4500 for a super clean one. they are out there but have cash for the deals.