I like ChrisSlicks call on the tune, as long as you have no physical problems (leaks I mean).
The O2 sensor "fool" solutions work well from my experience as long as you don't have an emissions state inspection. In my state, seeing one installed can lead to a failed emissions inspection. Then again, so would the absence of cats.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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