i cant see either of them causing a CEL. What type were they? I had Stillen G3 on my Z and never caused a issue, hell i changed the header, downpipe and exhaust (both the stock dp and exhaust were 2.5" i went to a 3" and a hi-flow cat) and that never caused a CEL...caused my fuel trims to go ballistic but thats about it.
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2011 Evo-GSR AMS 2.4 stroker/ bore, FP Black build in progress.
Sponsor: DSG Performance
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