It's actually the other way round. A user recently did a couple dragy runs for 1/4 mile and the 2020 ran 11.46 @ 121. Lower power and killing the rs7, not bad. And yes, the 12.3 is a stock 18 car, even though my stock car did 11.9 @ 116
Here's the link to the 2020 M550i dragy runs
https://g30.bimmerpost.com/forums/sh....php?t=1712248