A muffler shop worker told me that changing the catalyst system to anything OTHER than OE, even if there is a new converter, is not street legal. Is he right on that, or is there a fuzzy zone in the laws that permits custom Y-pipes so long as there's a converter in the system?
BTW, when a custom Y-pipe is installed (like the SHO Shop pipe), how do you fool the PCM into thinking it still has all four O2 sensors? Assuming, of course, you don't reuse the behind-the-pre-converter sensors...
Black/tan early '98 Contour SE Sport; dead-dead-deadsky (gone, split, outta here, afterlife kids)
'05 Pontiac Sunfire; 2.2L Ecotec, ATX, well-equipped
Mom also has black/tan '98 Mystique LS; V6, ATX, Alpine CD deck
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