Variable Back Pressure Exhaust: More supercars now employ variable back-pressure exhaust. It is somewhat like the variable intake manifold, which is located at the exhaust. Normal exhaust pipes for sports cars collect exhaust pulse from individual cylinders and combine them to a larger pulse, with a corresponding lower pressure behind the pulse. This low pressure actually helps drawing more air / fuel mixture into the cylinder from intake manifolds. This is so-called "reverse supercharging".