My 2004 Cobra has stock headers, Bassani x-pipes with 2 cats and Bassani cat back system. Couple years back it passed smog barely few points. But this time it failed about 24 points on HC(PPM) Max 52 my reading is 76. Some people told me its my x-pipes w/ cats, the cats goes bad after a few years to just put back my stock ford x-pipes. But when I called Bassani technical they said that it's 95% the problem are the 02 sensors that goes bad. So he told me to just replaced all four 02 sensors on the x-pipes and I can get away with not putting back my stock x-pipes. So can somebody give light to this on what should I really do? Shall I go ahead and try just replacing my 02 sensors or I really need to install my stock x-pipes back? Its a pain to do it almost no muffler shop here in California would do it now because they said it's illegal. The old shop I use to go closed down. Plus my tune will be all messed up if I go back to the stock x-pipes unless I don't have a choice.
Thank you in advance! I appreciate any feed back I could get.
Thank you in advance! I appreciate any feed back I could get.