Do some turbo engines look different than others? i.e some have a grilled rocker cover? some have turbo writen on the charger carrier some have ford on it some have nothing? and why do some have a fuel metering unit n it looks like some otehrs dont?

bit of a thick question but i gotta ask.

whats the diff between efi n mfi ??? how do i no what mine is? it has the meterin unit i no that much!!

if i bought a diff unit would it need settin up to my engine/fuel managment or just fit strate on and work?