The APR ECU Upgrade typically raises the power output of the 4.2 FSI to 443 horsepower and 382 lb-ft of torque on 93 octane fuel! Expect improved throttle response and a smoother, more powerful top end with no loss of drivability or reliability.
APR software is available in four Operating Modes, the desired operating mode can be selected at the time of programming. Mode switching is not available for this application.
Exact OEM Calibration Stock Mode
APR 91 Octane Performance Mode
APR 93 Octane Performance Mode
APR 100 Octane Performance Mode
APR Audi B7 RS4 4.2L ECU Upgrade Vehicle Fitment:
Installation: Installation can be performed at our facility on a drop in basis weekdays from 9-4. With APR's DirectPort ECU tuning the ECU can be programmed in around 40 minutes with no labor charge, no ECU removal or soldering is required.
Note: We recommend that ECU chipping be done at your nearest APR distributor, this will offer you the best technical support available. Check The APR Dealer Locator to find your closest APR dealer.
All APR ECU software comes with lifetime free updates (labor charges may apply). APR provides a lifetime warranty against defects in the software. All APR ECU upgrades have a 30-day Money Back Guarantee.