exskibum
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Yeah, that makes sense to me, too. Not to mention that it complies with my belief that the aftermarket Micron can with a 2.25 inch pass through ID just can't be acceptable. After all, it is louder than the two OEM mufflers that were undoubtedly necessary to pass the EPA noise certification requirements. And since it's probably not possible to put any single can on the end of that Micron header to meet that dBA requirement that isn't at least as bulky and aesthetically offensive as that C-14 howitzer, the header might as well be illegal. hwell:The way I'm reading it, as long as you are not mucking with the cat on up, you are okay. And I believe your comment is also valid as long as you keep OEM approved (hence, CARB approved) emissions gizmos in place and functional. The cans, on the other hand, are falling under the noise regs of the EPA and local noise ordiances, not CARB and should be a separate discussion, IMO.Hey, Tim -- thanks for that bit of research. I'll have to look at it more carefully, but it seems to say that headers and exhaust systems intended for non-CAT applications are not verbotten so long as all emissions stuff is reconnected. That would seem to save my XX's 4-2-1 system, since it is a legally registered 49 states model (in '03, only the CA Blackbirds had CATs). Like I said, I need to check more thoroughly, but hooking up a PC to it seems to have no saving provision.