After toying with a couple ideas I think I've finally settled on a f40 transmission and a LS4. Now I am looking for a turbo kit. I don't mind if I lose the trunk storage. does anyone know a kit that isn't too expensive?

There is not a kit to turbo an LS4 in a Fiero.

Not sure what your budget its, but LS4/F40/Turbo is 15K+ with you doing all the work. $25K+ if you pay someone else to do it.

[This message has been edited by fieroguru (edited 11-26-2024).]

Engine swaps certainly wake up the performance of the Fiero but horsepower costs money. Fieroguru has done the LS4 swap and I haven't but after doing six other assorted engine swaps they all cost a few thousand $$$ or more. With any swap you've got to fabricate (or buy) axles, mounts, wiring harness, fuel pump, .PCM (and programming) , A/C lines, exhaust system, belt tensioner, ignition wires, hoses/lines, cooling system, sometimes a new alternator, trans linkage mod etc etc etc. Then replace the bearing hubs suspension bushing and parts. All this is without a turbo and assuming that you don't need to rebuild the engine ( or modify it) that you plan to swap. Before you move forward I would suggest that you set a goal on what you want from your Fiero; street, street strip, road, show car or just a fun driver. Then decide your budget, gather up costs for the parts, quotes from a custom shop. There are really no inexpensive swaps.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

fieroguru, I spy that tubular cradle. Looks good.