Whoopsy:
And I can reply with 2 points also 
1. Mid engine vs rear engine handling.
2. GT4RS is a smaller car
Given a choice, I actually prefer rear engine (maybe the fault of 20 years of 911 track driving has warped me).
However, I do prefer a smaller car (would gladly shrink the GT3 if I could).
Can you give us a hint about suspension changes. This is where I think the GT3 has a big advantage on track over the GT4. Will the 4RS continue with struts at all 4 corners? If so, this is a limitation in my mind. Have they managed to squeeze more rubber under the front fenders (another issue resulting in understeer and front tire wear)?
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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