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Originally Posted by Minimization
Why do people think that this car will have more than 555 PS?
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Because insiders say so.
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The X5/6 M engine is complete and they are not going to modify it just for this car and the M6. The M5 will already have an advantage over these two hulks with respect to mass to power ratio and the addition of a superior 7 speed, 2 clutch gearbox.
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It's just a matter of a different ECU tune. It makes sense to tune the engine to the M5/M6 exhaust and transmission.
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Look at the upcoming 1M- probably will have the 335is/Z4 sDrive35is/740i/Li engine in it, no changes. And that will be good enough for ///M status.
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1M was done on a shoestring budget. It does not even get an M-specific engine to begin with. If the M5 followed that pattern it would just use the normal N63 with the optional power bump found on the X6 50i.