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Typically when an o2 sensor goes bad or is not present the vehicle will run rich and that is not a bad thing when racing. If I have any issues it will come from my engine being used and showing indiciations that the previous owner ran the hell out of it. Compression could be better on cylinder 1 and 2 coming in at 165. But in the essence of due dilligence and I am gonna double check with my buddies that build nothing but insane horsepowers IS300s to confirm my belief on the toyota stock ecu. I have all winter to hammer out this issue. THe races I run usually cover 6-7 miles and take 10-12 minutes. During that time its WOT and depending on the track and restarts the car will almost always be in second.
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