1967 ~ Barracuda 383-S and Dart GTS-383 ~ 280 HP 'How can this be.'

1967

The 383 4-Barrel {383/325 HP} when installed in the Barracuda or Dart GTS
was suspiciously rated at 280 Horsepower by Plymouth and Dodge.

While it was obvious that the Dual Exhaust System, primarily on the left {driver's}
side was restricted, did it effect the 383's Horsepower rating by a 'whopping'
45 HP when compared to the same 383/325 HP 4-Barrel in a Mopar B-Body car.