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I don't know about whether this applies universally, but if I reduce the back pressure on my car's exhaust, the engine will run leaner. I'm not sure of the exact reason, but it is something that tuners take into account.
Regardless, I'm sure that the NOx has to have increased significantly. If anything, these results look similar to the results I've seen for "high-flow" aftermarket CATs. Usually 100 to 300 cpsi (as opposed to the 600+ for OEM, ceramic CATs).
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