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It doesn't eliminate the cat, resonator or mufflers, so I would have to guess no.

One more thought, how about re-enabling the Catalyst code, then clearing, then turning it back off?

I think we're calling it two different things. It could very well be ACC, i mean two presses on the button, no engine on. Sorry man, sounds like you've tried all this already, that's about all I've got.

Is the key in on position with the engine off? It should be sitting there like you're going to flash a tune, then clear codes. Correct me if I'm wrong but the codes will not clear with the engine on or only in ACC mode.

The U is weird, I've only ever seen P codes. 301 is usually misfire in cylinder 1, but if you're not low on power that won't be the case. Have you tried resetting the codes and seeing if it comes back?

Do you have to pass emissions or inspections, in that case you really need the catted version. Obviously the difference is the catless flows better...

Dude, you answered your question while you were asking it. One has a high flow catalytic converter, the other one is a straight pipe...

Despite the vocal minority you still have many interested customers here!

It's just bpv (bvp valve = by valve pass valve), and I'm not saying don't wait for one. Obviously if tuning is not an option sticking with the factory system is definitely the better option. Do you idle your car for even a minute to warm it up? Cause that's 60 entire seconds of running rich. All...

Running rich happens literally for a split second when you blow off. You guys make it sound like you're permanently running rich.