Turbine Upgrade Turbo AUDI RS4 S4 2.7 K04-025 Turbocharger B5 A6 QuattroIntroduction A turbocharger (also called turbo), is a turbine driven forced induction device that increases an internal combustion engines efficiency and power output by forcing extra air into the combustion chamber. The key difference between a turbocharger and a conventional supercharger is precisely that a turbocharger is powered by a turbine driven by the engine's exhaust gas. A turbo consists of a compressor, a cartridge, a turbine and an exhaust