Rent/Hire The 2017 Mercedes-AMG G63 Coupe is a different car. Engine twin-turbo 5.4-litre V8. The 5.4-litre twin-turbo V8 with is 571 Hp of power and 760Nm of torque certainly provides ample entertainment for occupants and other road users. While it doesn’t sound as manic or raw as the old naturally-aspirated V8, the new more mechanical sound suits the new engine character rather well. It’s brutal, with cracks and pops, but probably not as loud as we’d like. Rent and drive it in Italy.