What audi engine should I put in???

[Poloracer]

I have the new 9n3 polo and have been hunting for a 1.8 turbo engine for some time but dont know what engine code should i go for. I want the 225 tt engine, again dont know what makes it different from the S3 types. It needs drive by wire, so do i need it to be a BAM code, or whats the difference from a apx code, any help????