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*U.S. flagship engine is a sweet 420-bhp 6.0-liter W12, an extremely rigid and compact amalgam of two small V6 modules joined at a 72-degree angle. Cylinder angles are 15 degrees; each has four valves and overhead combustion chamber with centrally located spark plug. Four chain-driven camshafts are adjustable on both intake and exhaust sides. A dual-path magnesium intake manifold broadens the 405 lb-ft of torque. Combustion is by single-spark ignition coils; fuel is controlled by VW's E-gas system. Other technical details include dual balance shafts; wet sump lubrication; oil-spray jets to cool pistons; and innovations to the cooling system, including a water-cooled generator. Four pre-cats and two main cats help the car meet the most rigorous exhaust gas standards. Powerful enough to take the car to 62 mph in 6.1 sec. and effortlessly attain the electronically limited top end of 155 mph, the W12 at rest is so quiet it can fool the driver into thinking it's stalled. It's a marvel of engineering that performs marvelously.