Ah, the 1970s. Gerald Ford was President, gas was $0.57 per gallon, and cars made no power because of early emissions equipment. This was especially true in West Coast USA, where the battle against air pollution resulted in enormous V8 engines making less than 200 horsepower. This mod adds a "West Coast Emissions" package to the Moonhawk Intake, bringing the once glorious 378 CUI V8 down to 156 hp and 254 lb-ft of torque. It does reduce exhaust smoke though, so that's a plus.
(As a native Californian, this mod was inspired by my state's overly rigorous emissions laws in the 1970s. Luckily, we're a bit closer to normal now.)