Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice so we may have to fine tune the answer. Feel free to add any additional info you feel is needed as we go on. Always keep in mind that I am here to help you with any questions.
The original pistons will stand up to about 5 to 8 PSI or about .35, to .55 BAR. Forged pistons are much stronger, and run about 100 degrees F cooler. There are places in the US that will custom make forged pistons, like ARIAS pistons, I will post a link for them HERE. With fuel injection this installation is difficult, as far as making the injection computer understand what boost is, and getting it to inject the correct amount of fuel. It is virtually impossible with some factory systems, because most engines run with vacuum in the intake, and the computer doesn’t know what to do when boost from a turbo occurs. The Megasquirt system I gave you the link to in the last post can deal with boost, and is a very good choice if you install a turbo. It is very programmable, and there is a forum of users for support, that helps a lot. The much easier route is to use a Weber 44mm IDF carburetor, and feed the air fuel mixture through the turbo. Still fuel injection is the best choice, the technical challenge is huge to make this work, the Megasquirt is the best choice for fuel injection. You can even buy the Megasquirt in kit form and build it yourself. If you have any more questions, as always, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.
I do not get paid for my work unless I am given 3 - 5 stars/smile faces. If the answer is not clear, let me know what additional help you need, and I will assist you further. A bonus and positive feedback are always appreciated, good luck and Thanks.