Its a Stock D16Z6 with about 95,000 miles on it.
I had read somewhere that the stock size is 75mm and that can be bored out to 79mm max. If I have it bored out I would only need to buy new pistons right? What would be the expected gains in doing this?

Long term goals for motor and car are a junkyard turbo setup. That will be a while though.

Thanks