i'm now running efi, and it's much better than a carb turbo setup or the mfi on my erst powered cab.
ok, ecu £330, wideband £230, inlet/sandwich plate/engine loom £100, injectors £40, miscellaneous parts £50 -pipe etc.
then time an dfuel to map it.
better driveability, better economy than either of the previously mentioned setups, granted mfi isn't too bad on fuel once setup, but lacks the finesse of the efi, on boost and off.
megasquirt isn't for everyone, but decent management can be bought for reasonable money.

just to add i already had bay loom, flywheel and other bits and pieces from a stripped car i had.