KB brothers. What octane rating you are running with the boost you are making? Iam running 19psi with 25% 100 octane rating and the rest 91; no ping or knock at all but it will ping with just the 91. Now I see that some of you guys are runnig pump gas, and as you know Ca gas s#cks big time. Is there a program to be use that can be made this run this much high boost with just 91 octane. I also figure that my mix of fuel comes to about 93.2 octane rating and runs good, the only problem is that I have to drive a few miles just to get some 100 octane and is getting old.