Hey barit1:
Unfortunately, I had the pleasure of flying only the A's and Q's - both had water injection (a whole story by itself ) and they both had the hydraulically powered rudder. I don't know if the existing powered rudder was sufficient to handle the bigger engines or not. But, I would imagine that the R's would have been a little less "attention grabbing" during takeoff roll.
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AirRabbit
PS - Thanks for the comment. I appreciate your understanding.