You won't get up to 180 with 400 horse, I don't care what tranny you get. The best way to make you car go faster is aerodynamics, if you decrease your drag coefficient, you go faster. Your mustang was not made to go that fast, therefore you would need to put gobs of power to the ground to get to those speeds. But even if you do get to 180 you risk losing control of your vehicle. It might even lift off the road, which would be fun for no one.
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