Some engines use two turbochargers. They will both be the same size. They are normally smaller than used on single-turbos engines. They are often used on V-type engines, such as V6s and V8s. Each turbo is powered by a separate exhaust pipe from the engine. Because they are smaller, they reach their optimal boost more quickly. This setup of turbos is normally called a parallel twin-turbo system. The first production car with parallel twin turbochargers was the Maserati Biturbo of the early 1980s. 