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it won't trigger the CEL (increase emission) as long as you keep factory primary cat intact, hence, your situation (cat-back exhaust), you won't need to worry about the emission. As for the smell, same story, if you leave your primary cat alone, it won't be too bad except the first heating cat cycle of the cold start.
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Challenge V-weave Front Lip & Mirror Caps | WSTO painted AW front grill & Mag Blue side grill & Mag Blue Tow Hook & Mag Blue mirror inner ring | Te-37 Mag Blue wrapped with R-S3 | Kreissieg F1 exhaust & X-pipe | KW V3 | Vortex EVO X GT-wing | Tinted LCI taillight | Nadi steering wheel & IND shift extension |
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