hey spork, i've done pretty extensive research on these IC's and from what i can tell, the starion and MK3 are similar in flow and the MKIV will outflow either of these, as JMBz said. the previous two are far better than no IC, however. how much boost are you looking to run? check out ZFerrari's install photos on his post a couple of weeks ago. he installed a starion and his boost went from 8.5 to 6, so the starion is fairly restrictive. he was happy with the performance, though. i read about another guy who installed the supra IC (MK3) on some other car and his boost drop was very similar at the same levels. (yes i am the guy selling the supra IC's but i am trying to be as unbiased as possible.)
anyone out there put a MKIV IC into a z?