:I purchased already new O2 sensors from courtesyparts.
the car will run poorly with out them.you will need to buy a wide band o2 sensor. I believe they run about $300.oo ball park. If you are using Haltech A/F display, I recommend buying theirs. There will not be an incompatibility issue. you will need to weld O2 sensor bungs on your down pipes or exhaust pipes. One bung in each pipe. I would plug one up and do all your tuning with the wide band o2 sensor in the other exhaust pipe. then, when all your tuning is done, switch the o2 sensor to the other exhaust pipe and verify they are both fairly even. the above is how you can tune your AFC without using a dyno. and actually, it is fairly more accurate then an dyno. On a dynoe, your car is only moving a 1,000 pound drum. In real life, you are moving your car. hope this helps!
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