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The cost is astronomical! Trust me. I visited Japan 4 years ago and was a guest at the MazdaSpeed facility and Tom's (Supra) shop. There N1 racing engines run around $30,000+. They are full racing motors. MazdaSpeed's 4cylinder 2.2 liter motors are pushing around 250-320hp. depending on how much tuning you want. They like to use Carbs. and No fuel injection although they do like Side drafts with Fuel Inj.
I am sure that in the future Nismo will build a more streetable high performance CRATE motor, but it will run you easily over $15,000 and push at least 350hp. You can even add side drafts!!!