The O2 extensions help with keeping the CEL light off on the HFC applications but have been met with only limited success in the test pipe application on the 370Z. However it does work well on the older 03-06 350Z's. The HR motors have much tighter control over the emissions system with an entirely new monitoring algorithm that's much harder to crack with mechanical fixes. Darn cars are getting smarter and smarter. If OBD III, aka "Big Brother", ever comes to fruition we are all in for a world of hurt....
We've had the extended O2 bungs on our HFC's and test pipes since 2005, long before it became "standard" for everyone else.
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