How much horsepower?

I have basically a stock crf50 powerwise, so If i got the bbk from tb with the 88cc, Race head and the 20mm carb kit around how much horsepower would i get, and is the race head really that important? Because i don't want to have put down more $$$ for something i really don't need :applause:

You would probably have around 7-8 horses

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