Obviously an ST150 engine from a mk6.5 … Custom loom (half mk5, half mk6, with the Omex in it) Custom mounts they are basically puma mounts but modified to fit with a bit of nip and tuck and welding a plate to the bottom to raise it up slightly.. (although these are available off the shelf from a few manufacturers but are about £300).. ST150 gearbox with the LSD from a mk6.5, Focus ST170 gear selectors and gear stick…
Some more customising in the gear box as the ZS runs a different style gear box to the ST.. (had to run the selectors through a new hole in the fire wall)
Also a custom manifold to fit the mk6 manifold to the mk5 centre section..
That’s the jist of it all..