"I don't believe the S-Car-Go headers have cats...at least ones I've seen so yeah they'll probably produce a CEL on 00-04 models unless you do the O2 sensor relocation thing and run a set behind the other set of cats. Even that is no guarantee though and some people still have CEL issues with that setup."
I agree, all their headers I looked at were cat-less, like my TTP headers. I put on high-flow cats after the TTP headers and added new oxygen sensors, still spent a long time chasing CEL's....
Ed
