Not sure, and no way to tell. I'd say there is literally a 0% chance that the engine is changed, since the car was developed over a 2 year long process with the upgraded N55.
I'd expect maybe a 10 HP increase to the base number? I don't know about a competition package, because the M2 CSL is likely on the way, and should be closer in price to the base M2 than the M4 GTS is to the base M4.
Was the M3/4 base horsepower upped for any year? I think by like 5hp, right? That's probably what you can bank on happening.
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Soon.
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