That website has a ton of information. That said, I think a CD of 0.3 is a little generous. The current Charger SRT has a CD of 0.335, 2015 BMW M5 is 0.33 and that website shows the Ford Fusion Energi and Ford CMax Energi as an estimate of 0.3. The 2013+ Standard Fusion is known to have been tested around a 0.28 CD and with both of those being eco focused cars, I doubt they aren't more aerodynamic than the EB SHO. My guess is 0.3 CD is that websites default if they don't know for certain car types.According to automobile-catalog.com, they estimate our CD at 0.3. They also estimate top speed without governor (no other mods, 200lb driver) at 167mph and a 252 mph top speed based on gearing/redline alone.
I am also not sure about the rest of you but I very much doubt that a stock SHO could crack 165 MPH given an infinite, flat and straight road. Mine stock wasn't exactly pulling hard past triple digits and the speedo was creeping after 130. I would think a stock non PP SHO would struggle to reach 150 MPH let alone 167 MPH.