Turbochargers use energy from engine exhaust to spin a turbine connected to a compressor, which pushes more air into the engine. This can increase power without requiring a larger engine, though the effect and response depend on the engine and turbo system. The category's automotive context is reflected in the Holset name, associated with turbochargers, and the Escort RS Turbo Mk4, a turbocharged Ford Escort model. Together, these references connect turbo technology with its use in road cars.