Maserati Quattroporte S is a twin-turbocharged 3.0-liter V6 that produces 404 horsepower and 406 pound-feet of torque. An eight-speed automatic transmission sends power to the rear wheels. Engine specs for the S Q4 are identical, but power is sent to all four wheels. Maserati estimates the Quattroporte S will reach 60 mph in 5.0 seconds and the S Q4 will do it in 4.8 seconds.