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m option pack is the speed-limiter being raised (m5 has this also)
carbon fiber roof (new), or steel roof with a sunroof just like 335i
m-drive just like m5 (m button for engine power,edc, seats,etc.)
edc=electronic damper control, again nothing new (m5,750li,760li,e34m5,etc.)
new gearbox = twin-cluth type just like dsg from volkswagen
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