If it's the 4 cylinder mustang it isn't breaking the bank bad. V6 on them not too bad either. You're screwed if it's a 5.0 mustang. That's a 400$ full coverage haha. And with the Porsche it is more of a luxury car and if anything goes wrong with it shops will charge out the ass to fix them (around here there's 2 shops that actually even touch porsches. And also if it the 911 turbo, that's going to bring the price up more too. Best bet is to talk to the insurance agency about prices on them.