Did You Grab the Right Key?
When you buy a Hellcat, you’re given two keys: a black key and a red key. The red key unlocks the car’s full performance potential, giving it a raucous 707 horsepower. The black key, however, “limits” the Hellcat to a conservative, rational 500 horsepower.
—Jalopnik: I Drove A Challenger Hellcat And I Almost Crashed It