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I know this may not be the suggestion you're looking for, but have you considered the C63 AMG with the P31 package? That puts the output up at around 481hp from the factory, and swaps out some of the engine internals with the same parts found in the SLS.
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2007 E92 335i--SG, Fully loaded, minus the dead weight..err..iDrive and Active Steering.
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