As long as you have done your research, I'm going by the gains I found changing from ZE core to cheap ebay core.
Nice setup in the MR2, Turbonetics wastgate bit of an overkill in my opinion but look good and seems to do the trick although any decent sized BOV will do the same. I used mits evo bov, its about 35mm and cost about $80 from wreckers.
Ditch the ze inlet and go for either a modified FWD plenum or custom job if funds permit, you will notice the difference.