Are you looking to convert to 5efte? Will need 3E Flywheel and 4EFTE clutch as far as I'm aware or have the 5E one re drilled (a bit sketchy) 4EFTE oil filter housing, for the oil feeds if running turbo. 4EFTE Thermostat housing if going turbo. Will need a oil drain put into sump, not sure if 4EFTE sump is direct fit. If your looking to go further than just that, you'd need 4EFTE pistons forged or standard up to you... 5EFE conrods forged or standard, up to you again... 4EFTE Head may help you out, with the valve springs (Assuming they're as shite as the ones on the 4EFE (N/A)) 4EFTE Rocker That's a very rough few things I can think of off the top of my head, would recommend reading a guide just to double check, I think theres one about on here, possibly by Taggy?