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The upstream, or O2-1 is the O2 that matters... The second one is just measuring difference pre and post cat. But O2-1 is measuring what the engine is doing, ie, fuel ratio, efficiency of burn cycle, ie, making sure engine air/fuel is reaching stoich...
Depending on what your tolerance is, there are ways to try and prevent the code while catless. Not sure on tuning availability with this platform but some 'older' platforms allowed for the turning off of code checks via the ECU, and would report all as normal. Not a good idea while driving of course, but for certain diagnostics, worked great. Get what I mean!? Unfortunately, newer ECU's or the programmers might not tweak these sections of an ECU either, so there's that. Down pipe really isn't hard to pop in/out and as a last resort, could just get the car up in the air, swap out the DP, drop a stock tune on it and get it inspected. Price of doing business...
Gotta PAY if ya wanna PLAY! Sometimes there's no easy way, but there's still a way!
Good Luck
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