Update - just ran my car through the STL-area's "scan-only" OBDII emissions check. All good. All monitors ready. Appears the cats are doing their jobs.
I've now put close to 20,000 miles on this xpipe, including a track day.
I did throw my first real code in like 18 months last month, right before the car needed inspecting, of course. Turned out the tstat sensor crapped the bed.
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