Here is 992 GT3 and GT4 RS split screen - can really see difference in gearing (as well as straight and cornering speeds):

Split screen GT4 RS vs 992 GT3 - YouTube


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22 GT3 Manual pending, 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