Unless you have advanced your timing, I would run 87 octane. Use the money saved towards mods. 
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Justin McClanahan
95 G20
15.4 @ 91.4mph (2.4 60ft  )
143.7whp and 131.4 ft.lbs
Primera (10:1) Intake Cam, HS CAI, HS Header, UR Pullies, 19* Timing, ACT, Lightened Stock Flywheel, GC/AGX, Pacesetter Short Shifter, and more stuff...
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