Four exhaust pipes sticking out the rear of a car might seem purely cosmetic, and in many cases, they are. But in others, especially in high-performance vehicles with over 1000 horsepower, quad ...

While they're undoubtedly cool on the right car, side pipe exhausts disappeared for a few reasons. Some models with them, like select Chevy Corvette Stingrays, had questionably effective mufflers.