Define "de restricted", the NSR doesn't have any physical restriction like the CBR400 did (at 113mph the bike cuts the spark to 2 cylinders), it was just set up in such a fashion as to only produce 45bhp and go 113 mph.

And don't be so sure about the "power" needed to run on the track with someone, I watched a young local lad run a bike with under 50bhp at the front of the fast group on my 1st trackday and have watched Billy run very close to Steve on his 130+bhp RC45.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread