[coyled]

Craig, I have the speed pro with the wide band o2 sensor in the collector. I would get the wide band o2 if I were you. It is the only way to know for sure what your air fuel ratio is. As you data log going down the road, the motor sees the exact load based on car weight gear etc.. and the air entering the motor is different at 100 mph turbulance wise than on a rear wheel or engine dyno. As you datalog and make adjustments, you realize that the o2 is slightly behind and make your adjustments earlier in the fuel curve until you get the exact ratio you want thru the entire rpm range. I now only use mine above 4500 rpm and above 80% throttle so that when I am running uncorked I will avoid a lean spot at high rpm. At high speed, when the motor cranks up at a slower rate, the o2 is dead on accurate as far as changes the o2 makes on the fly. In first or second gear, you add rpm so fast, its impossible for the o2 to read and adjust in real time. Hope this helps and good luck. scott