Shirley “Cha Cha” Muldowney may no longer reach speeds of 300 miles an hour, but she’s still keeping up a pretty good pace.

Tuning a muscle car up to 1,000 hp used to be considered a remarkable feat. But today, cars like the Dodge Demon 170 or even the new Corvette ZR-1 offer 1,000 hp as a turn-key solution straight from ...