Quote:
Originally Posted by nitebluesky
SO from what you are telling me is that the header with high flow the 02 doesn't like it near or far unless near a cat where the air is slightly resisted by the cat but moving fast enough that the 02 throws a code 48. Hmmm.
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It's not so much that the header you have has a "high flow" but that it has to much of a pulsed flow and when you let a gas enter to large of a pipe to suddenly it cools and it doesn't flow as well, so it could be that your o2 sensor is constantly using the heater to keep it warm or it could be that the exhaust pulses are to violent in the over sized pipe and is just rattling it to death.
Either way, I bet that if you replace the o2 sensor it will last a few months again before giving up until you fix your exhaust.