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o2 sensors

  1. LS1/LS2 Engine Tech
    I have a 04 A4 has pretty much all bolt ons and H/C. I have been running without o2 sensors for about 5 months now and the car does not like it when the air gets cold or dense quickly. Is there any other downside? My tuner said it was fine but I really feel like o2s would benefit with...
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