whats the difference between the RST MFI and the XR3I MFI? ive got an xr3i cab and i want to build a ZVH turbo for it but i need to know if i'll be able to use the xr3i injection system with an RST ECU, if not i'll convert it to efi and use a full zetec rather than a ZVH, i'm just weighing up my options

cheers