i doubt you could do the conversion yourself mate, the efi has more control over fuel etc from the ecu, unlike the mfi ecu is just an ingintion and boost ecu, efi can be setup better than mfi from a tuners point of view. but then ive just had mine setup at APT and the fuelling is there up to 21psi, i had to have te fuel pressure mod though.

if i was you, i would get a chip,cam,pace intercooler -31, and go to APT, they will transform your standard car and put a smile on your face!

The abs system can be removed quite easily speak to turbo.jon i think hes knows how to do it, u get a more solid pedal feel with it removed and its shit anyway hardly works on my most s2's anyway!