A 1966 Chevrolet Impala Super Sport doesn’t look like it’s hiding anything dangerous — until you hear it idle. This full-size Chevy carries the rare L72 427 option and a four-speed manual most buyers never checked the box for, a combination V8TV tracked down for its Muscle Car Of The Week series. The exhaust note alone has viewers stopping mid-scroll. Watch to hear why a 425-horsepower family cruiser still commands this kind of reaction decades later.