gen3 only the ADM/GRP A st205 had EGR/pollution gear. i've never seen a JDM gen3 with pollution gear.
just forget about the whole U on the end. the early st162 adm 3sge(non turbo) and the st185's had EGR, but you'll delete that with a rebuild etc.
but as said, no turbo JDM 3sgte i've come acrosss has had egr, only ADM. and seeing as the turbo mr2 was never released in australia, it means your JDM gen3 doesn't have EGR
9exhuast gas recirculation)
you need to list whats involved in the 10-12k. that sounds like it would involve a turbo upgrade?
if you want to go full rebuild, source all the parts via dylmrt as it's alot cheaper than getting the mechanic to supply as they will go through their retailers and you'll be paying top RRP australian over the counter prices.