Intercoolers need to be mounted so as to maximize air flow and promote efficient cooling. Cars such as the Mitsubish Lancer Evolution use front-mounted intercoolers mounted vertically near the front bumper, in line with the car's radiator. In contrast, cars such as the Subaru Impreza WRX mount the intercooler horizontally on top of the engine, and use a hood scoop to force air over the intercooler. Some World Rally Championship cars use a reverse induction setup, with air from ducts in the front bumper being forced up over a horizontally-mounted intercooler and then vented through ducts in the top of the hood.