Synapse Downpipe
They use a short bushing to back the probe away from the gas flow. When I first installed mine, I did not use the bushing, and it gave me a code. I installed the bushing, and no more problems. I really like my car.
The cobalt o2 sensors dont fit in your typical off the shelf spark plug defoulers like the first one list, not sure about the second one. We include our own we make in house with our downpipe, and havent had any complaints about CEL's with the defouler.
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