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"M" Button?
So this maybe a stupid question, but what does pressing the M button these cars actually does? I have heard/read that it opens up a flap in the exhaust and makes it louder, but is there anything else that's done to the engine after pressing the M button?
Recently a local X5M went up for sale and in the description the guy wrote something like, 'go from 350hp to 550hp with the press of a button'. Of course he was referring to the M button but I didn't think it impacted the engine in a way like this?
So I got curious...what does hitting M mean exactly? In my E92 M3 it made the revs go up etc but put the X5M in sport mode does that without even turning M Power.
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