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HiPo Next-Gen Mustang (S550) Prototype Spied -With Different Exhaust Setup and Sound. New Mustang Variant?

We have new pictures and video of a high performance Mustang variant prototype in testing. The prototype is outfitted with nearly all of the traits seen on the upcoming rumored-GT350 expected from the Special Vehicle Team – sporting a bulging hood, revised but covered front fascia, hood-mounted air intake and a functional vent located by the front fenders.

Noticeably missing however, is the distinct quad-exhaust setup seen on the other prototypes. This latest prototype is showing two of the exhaust outlets capped off. Also noticeable is a seemingly different exhaust note (potentially explained by the partially capped exhaust tips) which lacks the deeper throaty burble heard on the SVT prototypes heard to date. It remains to be seen whether this is just a next-gen GT350 sporting a different exhaust setup or an early prototype of a new S550-based Mustang variant.

Does this sound like a 4 cylinder, 6 cylinder turbo, the rumored flat plane crank engine or something else? Have a look & listen INSIDE and decide for yourselves.