I bought a Testa chip last year and never did get a chance to really try it out good until this year. This has to be one of the best chips I have ever used. I have been running Sunoco 110 leaded and I was up to 22 psi last night with only 0.5 degree of knock on the 1-2 shift. I think there is something that may be hitting because I get the same knock at 14 psi on the 1-2 shift. The chip is a 100 octane chip burned for my combo. If you read this Jim I was running my fuel pressure at 40 psi line off. My 02's were 790 as I crossed the line. Should I turn the pressure up slightly or is 790 acceptable?Bruce