The C63’s four-cylinder engine is a spectacular piece of engineering. To squeeze it up to 467bhp, AMG has plumbed in an electric motor for the huge turbo, spooling it up instantly to help the engine breathe and eliminate turbo lag. So, does that mean this furious 2.0-litre is on the limit of what can be done? Or is there still more horsepower to be liberated from it?
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