-015 The BorgWarner Turbocharger 03-04 Audi RS6 K04-015 is a high-performance turbocharger designed for the 2003-2004 Audi RS6. It is a high-flow, low-pressure turbocharger that is designed to improve engine power and efficiency. The K04-015 is capable of generating up to 550 horsepower and 550 lb-ft of torque, making it an ideal upgrade for those looking to increase the performance of their Audi RS6. It features a high-flow compressor wheel and turbine wheel, as well as a low-pressure turbine housing. This turbocharger is designed to provide a smooth and efficient power delivery, as well as improved fuel economy.