Im in the UK, so no problem re; emissions.
Are you exempt from the annual MOT test? MOT testing includes emissions testing and if you mod the engine you are likely to fail the MOT test. What is your plan for that?
I'm only increasing the fueling high up in the rev range, so it's nothing like creating a total fuel / ignition system. Now that would be real difficult!
Actually, you will have to create the the whole fuel/ignition system. As soon as your boosted manifold pressure goes past the MAP sensor's range, the ECU is not going to be able to measure the air mass and the mixture is going to get too lean, potentially leading to detonation. If you are going to boost the engine, you will have to get into the main ECU and modify it. There is no way around it.
Even if you do a manual wastegate and keep the boost off most of the time, as soon as the engine gets boosted, you will have to take over everything to control the fuel flow. You can not just "throw in some extra fuel" without precisely knowing how much extra to put in and when to put it in. For the "how much" part, you will need detailed engine test data. For the "when" part you will need timing information. And how exactly are you going to get the standard injectors to add more fuel? This problem is far more complicated than you appreciate. There is a reason the performance mods are that expensive.
however self education & helping other people make it worth while.
You have a lot more to learn about how engines work than you realize. I am not particularly knowledgeable about vehicle engines, but I do know enough to be scared by what you are doing. You on the other hand know so little so as to not be worried by your lack of knowledge. As for helping others, right now those you "help" will be classified your victims.
I suggest you spend a lot of time learning and
FULLY UNDERSTANDING how engines work, how they are controlled and the legal implications of what you are doing.
One final thought. When you boost the engine, you are adding horsepower. That puts a lot of extra load on the engine and the transmission. Have you analyzed if the engine is physically capable of handling the additional forces? What about the transmission?
---55p
Edited to add: You do realize that MOT regulations require any after-market engine modifications have to have a special safety inspection in addition to the regular MOT test?