[twin plugged targa]

I have just heard that the C2 has better handling characteristics and less weight making it more favourable!.
The C4 has too much understeer from what I hear.
I wpuld have thought the only advantage of a 964 c4 over C2 is in wet/icey conditions, and /or trying to lay excessive HP down to the ground.
I looked into doing a supercharged C4 about 4 yrs ago around the time that Excellence article came out, but it seems the turbo route is more widely reccomended.

Rgds Ben