Quote:
Originally Posted by Poochie
With that logic, spacers should work on a catless downpipe without any issues then.. Which it doesn't..
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I'm not an expert.
If there is a decrease in cat material and the O2 sensors are moved out of the exhaust flow a proportional amount then the sensors should continue seeing the decrease in emission the computer expects. That is until someone starts "tuning" other parameters, mixing gas, etc. IMHO those are people having a CEL w/the FSDP.
If you remove the cat entirely then there's no decrease in emissions between the sensors so the lower sensor would have to be so far out that it's not feasible to construct a catless pipe that way. Which is why it's easier to lie to the computer through programming...these are not the droids your looking for...
All that said, what the heck do I know.