The 14 Fastest Cars Under $20k

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4. Mazda RX-8

The Mazda RX-8 offers a practical rotary engine that is built for speed. This sleek sports car is designed for racing and has been featured in several, including the SCCA World Challenge and IMSA Continental Tire Sports Car Challenge. Most models can reach speeds of 150 miles per hour in 6 seconds or better. Top speeds for the Mazda RX-7 RZ, for example, were 165 miles per hour. Those interested in private racing can even enhance their vehicles with official full body kits, engine upgrades, catback exhausts, and suspension upgrades from MAZDASPEED. 2004 models are a practical choice if you are on a budget, but models as new as 2011 will easily cost under $20,000.