Amazing three videos of The Planes of Fame Air Museum (Chino, California). Listen to the smooth, unusal exhaust note of the engines. These Allison V-1710, 12-cylinder engines were both turbocharged and supercharged (although the turbochargers, still present on the P-38J Lightning "23 Skidoo" are not functional). The exhaust being discharged through the turbos accounts for the very subdued, silky smooth exhaust note of this aircraft. A totally unique and wonderful sound!!!