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My 05 G35x comes with the 6mt differential. I have reached 140 on several occasions with plenty of room to spare. I am sure the RWD AT models would be capible of even higher performance.
a member on 6mt.net reached 160mph in his 6mt Coupe on the Autobahn (bouncing off Rev-limiter)
I've done 145 in my G on OEM tires with half tread. I kept it pegged for about 10 seconds and wasn't climbing anymore anytime soon. This was on flat straight road, 241 Toll Road in so Cal. It was night time and it was cool out.