There is no difference. The existing turbo and intercooler would very most likely not be suitable for reuse. The existing tune would be meaningless. The issues with fitting things in are exactly the same.
Here’s a follow up question, what if you add a super charger to an already turned engine like a rb25det or something. Would the systems in place (inter coolers and exhaust manifold) be a good way to lessen time and head ache? Or would it be more annoying to add a supercharger to the turbo-ed system then designing a new system entirely?
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