Want to go fast, but don't want to spend a lot of money? There are quite a few different new cars out there that can accommodate your needs. The fastest cars under $40k prove that it's not necessary to swallow a monster payment every month in order to enjoy the visceral thrills offered by strong acceleration, a lively exhaust note, and a willing chassis. Technology has put affordable speed into the hands of almost everyone, and the list of quick and affordable cars gets longer with each passing year. Let's take a brief look at 10 of the fastest cars under $40k.