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The BorgWarner K04 left turbocharger is an aftermarket upgrade option for Audi RS4 applications supplied by the OE turbo manufacturer. This left-side unit mirrors original functionality with a water-cooled bearing housing and includes an actuator. It is presented as an aftermarket service or upgrade piece intended to match the left-bank turbo installation for RS4 engines where K04 replacement is required.
BorgWarner Turbocharger SX K04 Audi RS4 Upgrade (Left)
