| Most chinese IC cores have a very low fin density compared to name brand cores that are used by Stillen, etc. Obviously, this will have an impact on efficiency. Z1's IC's are probably chinese judging by their cores and pricepoint. I saw a pair of Z1 IC's first hand, and the fin count is pretty poor compared to my Stillens. I'll have to take a comparison pic. Maybe they're made by the dupemasters over at CNRacing.com I see the 300zx manifolds listed there as "exclusive", which no doubt are the MS knockoffs produced for AMS [ http://www.cnracing.com/intake_exhaust.html ]
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