smog
on mine they said egr i had fixed it still didnt pass so I had cats replaced wah lah passed with flying colors, I had new head pipes made with new cats that bolt to exh just front of res so I can revert to this stock setup for smog as I have exh cutouts and old cats on car for every day use i keep my cats for smoging time ,also my cats will still be new when I smog next time