Home / Make/Model/Year/Engine/Fuel / Audi / RS5 / B9 (2018-2021) B9 (2018-2021) GIAC Stage 1 Plus Audi RS5 B9 ECU upgrade 2.9T0 out of 5 $1,400.00 Sale! RaceChip tuning upgrade for Audi RS5 2.9T (444HP/331kW)0 out of 5 $799.00 $749.00