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High Quality Content by WIKIPEDIA articles! The S54B32 was a high-performance engine used in BMW M vehicles. The block was made from grey cast iron rather than aluminum to achieve greater rigidity from the same dimensions. It is a 3.2 L (3246 cc) engine; bore is 87 mm (3.4 in) and stroke is 91 mm (3.6 in). It has reinforced forged steel conrods, graphite coated cast aluminum pistons and a forged steel crankshaft. The S54 is the final, most powerful evolution of the M50 engine line, incorporating individual throttle bodies, drive-by- wire throttle control, and variable valve timing (VANOS) for both intake and exhaust camshafts. Power output is 343 hp (256 kW) at 7900 rpm with 269 ft lb (365 Nm) of torque at 4900 rpm with an 8000 rpm redline. The US version of this engine required some modifications to meet US emissions standards (such as close-coupled catalytic converters closer to the engine exhaust ports) and thus produced slightly less power in each application. In addition, air intake and exhaust differences, as well as a lower RPM limit, resulted in different performance figures for the Z3 M Roadster and Z3 M Coupé.