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F80 M3 here.
Roadnoise - yes, probably a product of the carbon roof and also wide (+sticky) tires in the rear. Is it intrusive? No, not at all. It isnt any worse than another mixed performance/dd dual purpose car.
Exhaust drone - no. This is with an aftermarket midpipe and valve controller. Even with the valves wide open, the drone is barely noticeable at highway cruising speeds. With valves closed and you got pretty much a silent cruiser in the noise department.
In summary, its not as quiet as a proper land yacht but it is leagues more solid than some prior cars (e.g. WRX/STI, various infiniti's, etc)
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