oh cause that's what i'm going to do my mk5a 3i 130 rs2k lookalike, use mk4 efi loom, frst ecu etc, 2l zetec lump. I've unpicked the the mk4 3i loom & to my surprize it just 4 wires needed to chop into the existing mk5 loom eng. bay loom plus sensors, most of which already on the zetec lump, if not all