"Calculators" for top speed don’t work for one reason...none of them have the ability to compensate for the "wind wall" that all vehicles experience once they hit that magic mark around 150MPH. Getting a 300HP car to 150MPH is easy, the right gearing and almost any car can do that. Getting past that mark or anywhere even close to 200MPH requires huge amounts of aero work and massive HP to push past "the wall".
There are dozens of factory vehicles that are geared to do those insane top speeds; very few actually can hit the number though. I think there are only 3 vehicle produced domestically that even do 150MPH.
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Dennis
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