COOL!
If it came from the factory with a turbo, it would be allowed... If not nope. If you walked into a Honda dealership and ordered a brand new car, and the dealer handed you an options list with special options like different wheels, turbo, body cladding, custom interior, and a custom paint job, that would be allowed.
The main idea here is to research and find out what options were, or in your case since you want to do a newer car, are, and build it as if you ordered it. The fun part is figuring out what parts you would add to the car that came from the factory, and to do that, you go online and find what options you could actually get. In your case, you could build it as if you went to Japan, and ordered a car that was not allowed to be sold in America. One of the rules is that you have to document what you added to it was available from the factory, With a link, or a copy of the options list from a dealership.