When we did our list of 400 horsepower cars under $20,000, the SVT Cobra was featured. While it's still possible to get one under $20,000, these cars are starting to be much harder to find in good condition. The SVT Cobra was built from 1993 to 2004, although we're only interested in the 2003 and 2004 models, known as the Terminator. These cars came with a 4.6-liter supercharged V8 which produced 390 hp. They also came with the first independent rear suspension ever offered on a Mustang. Under 20,000 were produced, and the cars were easily modified into some of the fastest cars on the road.