M Sport bumpers are a retrofit that BMW sells. It's not terribly expensive. I'd ask them to throw it in. M5 conversion would be a lot more expensive and your car isn't an M5 so you shouldn't do it anyways.
Does the car have any sport package? Are the window trims chrome or shadow line? The only things you'd be missing are the seats, steering wheel, and footrest pedal but the last 2 can be retrofitted.
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