[projectsupramk3]

Nope, everything will be a straight swap. You won't even have to take the ECU or wiring harness out of the car when you swap the engines. Just unbolt the upper manifolds from both engines and pull the harness' out. Lay it over the windsheild or something and don't forget to mark sensors and plugs with masking tape so you don't forget where they go when you're plugging the harness up to the JDM engine.