mate ive been told full 16v zetecs with std cams pistons ect will be happy at 250 bhp with a turbo bolted on and was also told is cheapest way but on the mfi couldnt say mate dont think i know of any, not sure if doo,s 2.1 was mfi i think if was possible you,d need 5th injector and by the time you fak,d about id say just save and go efi mate, fiesta turbo h reg ecu and loom inlet will give you efi at half the cost of cossie