My '93 RX-7 had a double bubble roof and a sunroof. In that case, the panel went up and outside the car body when open.
The M4 will have a sunroof option. Whether they swap out a different roof panel without the double bubble, use a curved glass piece, or a solution line the RX-7 did remains to be seen.
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2017 F-type SVR Black/black
2017 Nissan GTR Red/black
2022 BMW X5M MBB/SO
Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...
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