APR ECU Upgrades for Audi RS4/RS5

Two new updates for the B9 RS4 and RS5 with the 2.9T EA839 V6 engine!

First is their v1.3 update for APR Stage 1 and  Plus. It features a new launch control routine that allows for a better launch off the line while also adding protection for the driveline. Additionally they’ve adjusted an RPM fluctuation that occurred on some vehicles during a cold start.

Next up is their Stage 1+ ECU Upgrade. This update includes all of the new v1.3 updates while adding support for the new APR High Pressure Fuel Pump (HPFP).

On their E85 program, this new update delivers up to 561 HP and 608 FTLBS of torque. That’s +138 AWHP and +169 AWFT-LBS over stock, and +37 AWHP and +50 AWFT-LBS over APR Stage 1 on E85. For all other octanes Stage 1+ delivers the same power as Stage 1, but allows you to properly use their HPFP upgrade.