do you need the surpressor,im trying to change my xr3i loom to work with the ofab management but some sites say you need the surpressor and some say that its not needed,ive got all the ecu pin/colours to the sensors but just need to find out about the surpressor

ive looked at the different sites but they arent really much help as ive tried the turbo conversion 3 times now on 3 cars using the efi xr3i looms and ofac managment,each time ive done the conversion which is supposed to not involve any changes to the loom ive had the same problem with each car which all 3 have overfueled massively