Basically, the engine bolts straight in. You keep the bottom mounts that are bolted onto the crossmember and change the engine mounts to EB/EA or something. (engine will touch the brace on the bonnet, but you can just cut that off). As for gearbox crossmember, I use the same crossmember for both a T5 and C4, so they are available anywhere(no mods needed). Wouldnt be that hard to fab up a crossmember for the ZF box anyways. But then you need a custom tailshaft etc If your going to use a C4, you can get a bellhousing to suit from torque power (if you go down that path). Regarding the diff, you can use a LSD diff out of an EB or so. Mine survived months of abuse with 700rwhp+ (although never on slicks) and never broke. Wiring, check the below link. Basically clips on, you wire in a couple things and its good to go. http://www.ebay.com.au/itm/FORD-BA-BF-XR6-TURBO-MANUAL-Standalone-engine-harness-/261099864605?pt=AU_Car_Parts_Accessories&hash=item3ccac3c21d You will need to change the throttle body off the engine as they are fly by wire, unless you want to install the pedal assembly into the xf. I wouldnt bother with the turbo and manifold if your chasing 500rwhp, people on here have made that with a standard turbo and manifold ( others on here will know more about that side of things)