The other post reminded me to ask this. So i have a completely stock d16a6 Si engine, with only like 40K miles on the engine total in the last 11 years. I have ONLY run 87 gas on it since i got it, even during races. I have a CAI, header and gutted cat that eventually goes to a stock muffler. So when do you think I should start using higher octane gas? I am planning on installing a 89 integra ECU in and see what that does.