My thoughts would be just get an S4 turbo assembly, ecu, harness, etc. Some misc. GSL-SE parts and swap it in.
It has a higher chance of working right the first time and the driveibilty will be much better.
The 12at motor (the ACTUAL 12at) is similar in a lot of ways to a GSL-SE but the control systems are very different. The throttle body on the 12at is a lot like the Nikki carb in design, only its not a carb at all. So the intake manifolds may only be slightly different.
The distributor is also different since it can reference boost pressure as well.
I have 1/2 of a good writeup on swapping 13bt engines into first gens. I can finish it sometime here and put it up.
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