This troper's brother is a DIY mechanic who buys old cars and soups them up for autocross racing. The best one so far was a rusted-out '84 Mustang: he upgraded the drive train and tires, tuned the engine, and, most importantly, installed a turbocharger. 'Cause the thing about turbochargers is that they a) can double the engine's horsepower, and b) take a second to kick in. When out on the road, he'd pull up next to shiny new sports cars at stoplights and rev his engine at them. The other driver would see a beat-up old junker with what sounded like a sad little four-cylinder engine and, smiling smugly, would accept the challenge. Then the light would turn green, the turbocharger would kick in, the Mustang's engine would give a mighty roar, and the other car would be left in the dust. (Copied from TheAllegedCar)