Upgrading and modifying cars is a billion-dollar industry in America, where the love for speed means that the fastest cars aren’t fast enough out of the factory. Tanner, Adam, and Rutledge aren’t convinced that the performance offered by expensive up... (more)grade packages is worth the price, so they get three iconic American muscle cars with the best aftermarket upgrades money can buy. The cars are then put through a series of adrenaline fueled tests to see which offers the best bang for your buck.