The Arnage is over 5.4 metres (212 in) long, 1.9 metres (75 in) wide. For a brief period it was the most powerful and fastest four-door saloon on the market for a brief time. The final run of 150 "Final Series" models have the following specifications. The Arnage Final Series includes the Arnage T powertrain, including the twin-turbo 6.75 litre V8 Engine that produces 500 metric horsepower. The powertrain delivers torque to the rear wheels via a six-speed ZF automatic gearbox. Outside, the Final Series features unique 20 inch alloy wheels, a retractable 'Flying B' mascot, body-colored headlamp bezels, dark tint matrix upper and lower grilles, lower front wing vents, a 'Jewel-style' fuel filler cap and special badging. The interior, designed by Mulliner, The model also comes with two special umbrellas and a premium 1,000 watt audio system. The Final Series also marks the 50th anniversary of Bentley’s V8 engine. The 2009 variant of the engine is still loosely based on the same design that was introduced in the 1959 Bentley S2. Now with twin turbochargers, the all-aluminium alloy engine delivers 0-60 mph in 5.3 seconds in a car weighing 2.5 tonnes.