362bhp and 490Nm from the 550i, which I admit is a bit anemic - giving away 5bhp and 21Nm to the C55.
All top end too, not as much mid range grunt. You need a nice big positive displacement blower sticking out through the top of the bonnet. And a chrome ram scoop.
@Dammit started
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362bhp and 490Nm from the 550i, which I admit is a bit anemic - giving away 5bhp and 21Nm to the C55.