reginos:

The official (as per published Porsche spec)  top speed of the RS is 296 km/h (184 mph), much lower than the 318 km/h of the GT3 PDK and 320 km/h for the manual.

Drag and shorter gear ratios would think. Nevertheless, on a circuit such top speeds are of academic importance.

   
   

Right - it seems 992 RS has more drag than 991.2 RS, even with DRS…


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22 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 18 GT3 Manual, 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi