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Yeah you need harness and ecu for the swap the afm 4agze from another 2 will drop straight in and bolt to the same box and clutch and plug up minus one dash light (Supercharger light). The map engine (from something like a gtz levin) bolts in no problem but needs some custom wiring to make it work. You can have a loom made for the right price from the old one (from the 4agze).
The other engine the 20v 4age comes from the levin as well and makes about the same horsepower it bolts in and up to the drivetrain as well but also needs wiring. Will need the ecu with it the ecus do not swap over from engine to engine at all and neither do the looms as a general rule.
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