Phil, I am glad you brought that issue up of octane. I have the air box, headers and exhaust on my H2 and I have the Predator tuning system. I have the tune in from there programer and have used the real time data system to monitor the knock retart readings from the ECU, I run regular 87 octane and with WOT have no KRTiming at all. So Phil is correct save your money unless it is 105 temp and or you have a SC.
03 H2
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03 H2
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