as far as i know the 5e makes more torque and spools the turbo quicker, but someone with more experience with the 5e engine will be able to give more info. kevin
all your 4e stuff bolts straight onto the 5e block, the only thing you have to change is the flywheel to a 3e te flywheel to let you use the 4e clutch.
looking £150 + postage for block and crank.
kevin