We have exclusive photos of an S650 Mustang test vehicle with a new rear brake setup that not only has the typical smaller rear caliper, but a bigger caliper towards the front with a parking brake.

This is new and not on any current S550 Mustang. It's a setup found on many AWD vehicles and could very well hint that the S650 Mustang won't just be RWD like the outgoing model.

The prototype could also be heard driving by with what sounds like a V8.
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