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  1. R35 GT-R
    At what power level would it be recommended to go from c16 to c23? I'm sure a few shops have tuned with c16 and c23 on cars around 1200 whp or higher. Is C23 overkill at this level? Is it safer with the higher octane rating and will allow a little extra advance in timing? Not interested in...
  2. Engine
    Anyone got experience or views from the GTR community ?
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