93 isn't nessassary, don't waste your time looking for it. We have alot places with 93 around but I don't go out of my way to go find it. From 91 to 93, the increase in performance would be marginal at best. 91 will work fine in the Z.
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09 Nismo - HKS | Berk | HPS | K&N | Zspeed
09 Maxima | 09 CBR 1000RR | 02 CBR F4i
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