Home / Make/Model/Year/Engine/Fuel / Audi / RS6 RS6 Sale! RaceChip tuning upgrade for Audi RS6 4.0T (591HP/441kW)0 out of 5 $799.00 $749.00 Sale! Gift card $10000 out of 5 $1,000.00 $800.00 Sale! Gift card $5000 out of 5 $500.00 $425.00 Sale! Gift card $2000 out of 5 $200.00 $180.00 GIAC Stage 1 Plus Audi RS6 C5 ECU upgrade 4.2T0 out of 5 $1,600.00