dunno bout 240z but i payed 1500 for turbo back 3" system for the sky including custom dump (to open up waste gate) hi flow cat, ss mufler, mandrel bends. cat and mufler supercat parts done by muflers r us in mandurah guy was way helpfull we chat for ages bout what i want and how loud what intend ta use car for an s$#% find someone who is willing ta chat with yas an theys the go you know theyre gunna put in the effort to make it great