{"product_id":"catalytic-converter-for-cadillac-cts-2008-2011-3-6l-left","title":"Catalytic Converter for Cadillac CTS (2008-2011) 3.6L Left","description":"\u003ch2\u003eDirect-Fit Left Catalytic Converter for 2008-2011 Cadillac CTS\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit left catalytic converter replaces failed factory emissions units on the 2008-2011 Cadillac CTS to restore exhaust scavenging, eliminate catalyst-efficiency DTCs, and ensure correct emissions compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Cadillac CTS Catalytic Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory catalytic converters on the \u003cstrong\u003eSigma II\u003c\/strong\u003e platform suffer internal washcoat thermal fatigue and ceramic brick crumbling over extended thermal cycling. The direct-injected \u003cstrong\u003eLLT\u003c\/strong\u003e 3.6L V6 operates under elevated exhaust gas temperatures, accelerating washcoat breakdown of precious metal catalysts (platinum, palladium, rhodium). This failure mode leads to restricted exhaust flow, substrate rattling, increased backpressure against the cylinder head, and recurrent P0420\/P0430 diagnostic trouble codes that trigger persistent check engine lights and reduced fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement assembly utilizes a high-flow ceramic substrate housed within a heavy-duty, corrosion-resistant stainless steel shell. Engineered specifically for the driver-side (Left) exhaust bank, it features precision laser-cut mounting flanges and mandrel-formed transition cones to prevent turbulent boundary-layer separation. The integrated heavy-gauge tubing resists thermal deformation and cracking under peak exhaust temperatures. Built as a direct bolt-on unit to match factory geometry, it integrates factory-located O2 sensor bungs and includes installation gaskets for an airtight seal without cutting or custom fabrication.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2008-2011 Cadillac CTS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e3.6L High Feature (LLT \/ LP1) \/ Sigma II\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e304 hp \/ 273 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e17121626, 16685\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2008 Cadillac CTS 3.6L V6 (Left \/ Driver Side)\u003c\/li\u003e\n  \u003cli\u003e2009 Cadillac CTS 3.6L V6 (Left \/ Driver Side)\u003c\/li\u003e\n  \u003cli\u003e2010 Cadillac CTS 3.6L V6 (Left \/ Driver Side)\u003c\/li\u003e\n  \u003cli\u003e2011 Cadillac CTS 3.6L V6 (Left \/ Driver Side)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the Sigma II CTS?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2008-2011 Cadillac CTS equipped with the 3.6L \u003cstrong\u003eLLT\u003c\/strong\u003e or \u003cstrong\u003eLP1\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve P0420 or P0430 diagnostic trouble codes?\u003c\/strong\u003e\u003cbr\u003e Yes, replacing a degraded factory substrate with this high-efficiency ceramic core restores target oxygen storage capacity and eliminates catalyst efficiency codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Cadillac Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet rigorous emissions tolerances without triggering check engine lights, this catalytic converter maintains original powertrain calibrations and optimal exhaust flow velocity for luxury performance sedans.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501680201976,"sku":"DS-EZCBKE0B3","price":183.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-cadillac-cts-2008-2011-3-6l-left-1.jpg?v=1789329371","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-cadillac-cts-2008-2011-3-6l-left","provider":"Performance Chip Tuning","version":"1.0","type":"link"}