na mate you need a cosworth rear exhaust housing to get any benifit other wise you might aswel keep the rst t3...

im after £500 for the whole set up its a nms spec turbo
custom made down pipe that slots in to you rst 2.5" exhaust
turbo complete done 2k and built to run at 2bar lol
actuator and bracket
new oil feed and mint return pipe
and has the water pipes for a s2 aswel

whole lot