- 2015+ X6M 4.4TT , Uncategorized- AUDI C8 RS6 ECU SOFTWARE UPGRADE- Vehicle Application: Audi RS6 4.0 - Horsepower Gains: 135-145hp - Torque Gains: 210-220tq - Note: - This purchase is for AMR Performance software and due to the non-tangible nature of this product, all sales are final. There are no refunds. - $1,799.99- - 
c8 rs6 tune
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