A 707-horsepower Challenger Hellcat’s test day at Willow Springs wasn’t a random venue choice — it’s a return to a track built on a mistake. Bill Huth bought the circuit in 1962 planning to run drag racing down a straight that was too short, and spent the next five decades turning it into one of America’s most demanding road courses instead. Here’s that story, and what a Hellcat has to prove there.