Firstly please don't use TXT speak (i.e please type "to" not "2") as it's very confusing for some people who don't speak English that well.
Secondly, yes, in stock form an mc16 is no less powerful than any other NSR and more powerful than an mc28.
The 45bhp limit was a Japanese law, it was reduced to 40bhp in 1993 hence the mc28 is 40bhp.
The "problem" is, on the mc18 mc21 and '28 the engine is electronically restricted to 45 (or 40) bhp, on the mc16 45bhp is the power the engine makes.
The mc18 and mc21 are very easy to get 60bhp from with just a couple of wiring modifications. The mc28 is somewhat harder but it can be done without touching the engine.
The mc16 requires the carbs, barrels and heads from another model, mc18, 21 or even 28 though the '28 carbs are a pain to work on.
In theory the top speed of any standard NSR is 113 mph (185kmh) which once again was a Japanese legal limit.
If you get the power to to around 60bhp you could see 125-130mph, maybe slightly higher f you're small enough to tuck in behind the screen properly, most westerners aren't
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Please do not PM me technical questions, if you can't find it on the Forum start a thread