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Engine sound is quite similar to the one I have in my 535d xDrive 313 hp, 630 nm tourque. But mine has just rolled 700 km, so I have not run it at high rpm. M550d engine and 535d 313 hp engine is the same, but M550d have an extra turbo-powered electric.
Last edited by bimmer man; 02-21-2012 at 10:15 AM..
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