<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Twin - turbo or biturbo refers to a turbocharged engine in which two turbochargers compress the intake charge . The most common layout features two identical turbochargers in parallel; other twin - turbo layouts include sequential and staged turbocharging, the latter of which is used in diesel auto racing applications . </P> <P> Paralleled twin - turbo refers to the turbocharger configuration in which two identical turbochargers function simultaneously, splitting the turbocharging duties equally . Each turbocharger is driven by half of the engine's spent exhaust energy . In most applications, the compressed air from both turbos is combined in a common intake manifold and sent to the individual cylinders . Usually, each turbocharger is mounted to its own individual exhaust / turbo manifold, but on inline - type engines both turbochargers can be mounted to a single turbo manifold . Parallel twin turbos applied to V - shaped engines are usually mounted with one turbo assigned to each cylinder bank, providing packaging symmetry and simplifying plumbing over a single turbo setup . When used on inline engines, parallel twin turbos are commonly applied with two smaller turbos, which can provide similar performance with less turbo lag than a single larger turbo . Some examples of parallel twin - turbo inline engines are Nissan's RB26DETT, BMW's N54 and Volvo's B6284T and B6294T . Some examples of V formation engines with parallel twin - turbos include Mitsubishi's 6A12TT, 6A13TT and 6G72TT; Nissan's VG30DETT and VR38DETT; and Audi's 1997 - 2002 S4 (B5), 1997 - 2005 A6, and 2003 - 2017 RS6 . </P>

What is a twin turbo engine in cars