Home >> Audi >> 2021 >> S4 Premium Plus >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Turbocharger, Supercharger Servicing - 3.0L >> 21 Turbocharger, Supercharger >> Charge Air System >> Air Duct Pipe, Removing And Installing >> Lower Air Duct Pipe, Removing And Installing >> Tightening Specifications