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America loves speed, and for some people the fastest cars out of the factory just aren't fast enough. Upgrading and modifying cars is a billion dollar business, but upgrade packages can cost as much as the car itself. So Tanner, Adam, and Rutledge want to know if amped up performance is worth the price. To find out, the guys take three iconic American muscle cars with the best aftermarket upgrades money can buy and put them through a series of adrenaline fueled tests to see just how much bang you get for your buck.