I truly recommend that you do a lot more stydying about turbos before you start this project. Here are a few of the variables that you will need to better understand.
The larger the turbo, the more the boost, but only if you generate enough exhaust pressure to spin the turbine.
The larger the turbo, the greater the turbo lag, or the time it takes for the turbine to spool up to produce the boost.
Compressing air generates higher temperatures to the air creating the need to cool the air before it enters the cylinders. This is usually done with an intercooler.
Higher cylinder pressure generated by the turbo will require less timing advance.
More air will require more fuel so that the correct air/fuel ratio is maintained.
Higher cylinder temperatures from the additional boost will usually require a colder spark plug.
Higher cylinder pressure usually requires either less spark plug gap or higher spark plug voltage or both.
Upgraded cooling system is often needed.
The entire issue of engine controls must be addressed. CPU may not be able to operate with boost instead of vacuum in the intake. Sensors must be able to read boost and not just vacuum.
A quick example of the Volvo aproach to turbo applications. The T5 uses a large turbo which gives a lot of boost and a lot of horsepower. It also has a very noticable turbo lag. The low pressure turbo engine on the other hand, uses a smaller turbo, it makes less horsepower with less boost but has nearly imperceptable turbo lag.
I recommend some time in the library or on the internet to gain more insight about these and other pitfalls if you intend to try this yourself, or just let someone else do the digineering a buy a ket when it becomes available. I think Hightower may have one already or will have one very soon.
