
APR presents the Audi RS4 4.2l Stage III supercharger system.
APR’s Engineering Teams are pleased to present our first iteration of the Audi 4.2l V8 FSI supercharger application. Producing over 570hp and 510 ft-lbs of torque, APR’s RS4 Stage III propels one of Audi’s most prestigious performance vehicles to new levels of acceleration and performance.
Applying forced induction to a normally aspirated production engine is no simple task and APR’s Engineering Teams understand that new innovations, processes and components must be incorporated into the design to insure OEM reliability and drivability while producing incredible performance results. Within APR’s Stage III, you will find more components and higher quality parts at every comparison than with any of the competing products currently available. The goal of APR’s design was not merely fitment and operation but consideration of the long term effects of such a dramatic power increase and the overall reliability of the vehicle. Extra steps must be taken to insure Performance Without Compromise.

Not only will RS4’s equipped with APR’s Stage III produce blistering increases in wide open throttle acceleration, daily driving is greatly improved with increased torque and horsepower available in even the lowest rpm’s of the power band. Less downshifting for passing and greater rates of acceleration at all points result in a driving characteristic of pure enjoyment in all situations. Both Drag Racing and Road Racing demands are taken into consideration during the design and calibration process in order to provide a well rounded solution for all enthusiasts.

APR began supercharger development of the Audi 4.2L V8 engine in 2004. After several design reconsiderations and the availability of new technologies, APR is confident that the each component included in the Stage III system is of the highest quality and is perfectly matched to the 4.2L application. All components necessary for a full installation and enjoyment of use including the expertly recalibrated engine management software are included with the exception of an upgraded clutch for the transmission. APR's Engineering Team developed and selected the best components possible, not a component that merely fits the bill but exceeds expectations in order to produce unsurpassed quality.

Dyno DataProgram Mode* | Peak HP | Peak TQ | Largest HP Gain Over Stock | Largest TQ Gain Over Stock |
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*It is essential to ensure your vehicle is filled with at least the minimum octane rating for each Performance Calibration when activating the program. |
?Figures Measured Using Stock Intake and Stock Exhaust System |
Stock Advertised by Audi | 420 HP | 317 LB-FT | - | - |
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Stock Measured by APR | 420 HP | 337 LB-FT | - | - |
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APR 93 Octane (R+M)/2 or 98 RON? | 590 HP | 454 LB-FT | 177 HP @ 7800 RPM | 130 LB-FT @ 5100 RPM |
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Acceleration DataProgram Mode* | 0-60 MPH | 0-100 MPH | 60-120 MPH | 50-130 MPH | 1/4th Mile ET | 1/4th Mile Trap |
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*It is essential to ensure your vehicle is filled with at least the minimum octane rating for each Performance Calibration when activating the program. |
?Figures Measured Using Stock Intake and Stock Exhaust System |