Automatic Deposit 5000 Doors 4 Seating 5 The RS Q8 is the ultimate variant of Audi’s top SUV model, the Q8, and Audi reserves the RS badge for its highest-performance automobiles. Although the RS Q8 shares a 4.0-liter twin-turbocharged V-8 engine with the less powerful SQ8, it stands out thanks to its staggering 591 horsepower and aggressive design.