15 Muscle Cars That Were Born to Break the Rules—And Did

12. 1971 Plymouth GTX 440+6

The 1971 Plymouth GTX 440+6 was a rare beast that roared into the new decade, refusing to let muscle car tradition fade.
Equipped with the legendary 440-cubic-inch V8 topped by three two-barrel carburetors (“Six Pack”), the GTX produced thunderous power and breathtaking acceleration.
As emissions regulations loomed, this car stood as a defiant reminder of Mopar’s performance prowess, keeping the muscle car spirit alive just a little longer. Hemmings