The syntax wasn't the greatest but I believe what he meant was that a B16A with a turbo would be 20 hp more than a turbo on his current motor.
To the original poster: since you're in the early stages of this the best thing you can do is figure out real answers to these questions.
- How much money do you want to spend?
- How much power do you want to make?
- How much risk of blowing your motor are you willing to take?