The RS4 Avant generates its personality from a hand built 4.2-liter V8 engine that produces 450PS ( 331kW / 444 hp ) and 430 Nm (317.15 lb-ft) of torque. It allows it to accelerate from 0-100kph (0-62mph) in 4.7 seconds before hitting an electronically limited top speed of 250kph (155mph).