I just inquired of TPC re their tune that eliminates O2 codes and was told that they are no longer offering such tunes or even catless headers. Seems that the EPA has these mods in their sights.
Discussion summary
YOUR RESEARCHGet Your Catless Headers and Tunes While You Can
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I figured that would be coming. But just to be clear, be aware that getting it "while you can" won't likely grandfather you into keeping it. I expect they'll come up with some way to make you get rid of it afterwards. I think CA has been doing this actively, for example... many posts on many forums trying to come up with ways to get around it, and CA is onto most of them... so this will likely spread to other states.
I'm not aware of any US tuners offering DTC/CEL removal any longer.
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