There are a handful of turbo LS4 swaps in Fieros, but everyone is doing it differently and very few have documented their process.
Generally speaking if you want to learn as much as possible about turboing an LS engine:
https://ls1tech.com/forums/forced-induction-9/I am slowly working on adding a turbo to my LS4/F40 swap... My intention is to keep the stock trunk and keep the turbo hidden as much as possible.
LS4/F40 Build thread. Turbo details are in the last 5 or so pages:
//www.fiero.nl/forum/F.../HTML/000123-37.htmlhere is the mockup setup as I build the needed parts:
Here is the engine in the car last summer. It is now out getting more upgrades. I doubt the turbo will be ready for summer, but who knows...