{"product_id":"catalytic-converter-for-cadillac-cts-2004-2007-2-8l-3-6l-left-right","title":"Catalytic Converter for Cadillac CTS (2004-2007) 2.8L 3.6L Left \u0026 Right","description":"\u003ch2\u003eDirect-Fit Catalytic Converter Set for 2004-2007 Cadillac CTS\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Left \u0026amp; Right Catalytic Converter set restores factory emissions efficiency and corrects exhaust backpressure on the 2004-2007 Cadillac CTS without custom exhaust fabrication.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Cadillac CTS Catalytic Degradation\u003c\/h3\u003e\n\u003cp\u003eOn the \u003cstrong\u003eSigma I\u003c\/strong\u003e platform CTS, the factory catalytic assemblies frequently suffer from internal ceramic washcoat erosion and thermal fracture due to extended heat cycles from the GM \u003cstrong\u003eHigh Feature V6\u003c\/strong\u003e architecture. Over time, high exhaust gas temperatures lead to substrate crumbling, localized exhaust clogging, severe backpressure spikes, and recurring P0420\/P0430 diagnostic trouble codes. Furthermore, fatigued factory flange welds and thermal cycling cause exhaust leaks ahead of downstream O2 sensors, disrupting closed-loop fuel trim calculations and robbing mid-range torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit pair is fabricated from durable, corrosion-resistant 409 stainless steel tubing to resist road brine and excessive thermal stress. Each bank features a high-grade ceramic honeycomb substrate engineered with uniform washcoat precious metal loading to maximize chemical conversion of HC, CO, and NOx while minimizing flow restriction. Mandrel-bent runners preserve linear gas velocity, while thick, laser-cut OEM-spec flanges bolt straight to the factory exhaust manifolds and mid-pipe. Supplied installation hardware and high-temp composite seals eliminate persistent exhaust leaks, ensuring reliable downstream sensor response without the need for custom welding.\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;\"\u003e2004-2007 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;\"\u003e2.8L LP1, 3.6L LY7 \/ Sigma I\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;\"\u003e210-255 hp \/ 194-252 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;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2005-2007 Cadillac CTS Base Sedan 4-Door 2.8L 2792CC V6 GAS DOHC Naturally Aspirated\u003c\/li\u003e\n  \u003cli\u003e2004-2007 Cadillac CTS Base Sedan 4-Door 3.6L 3564CC V6 GAS DOHC Naturally Aspirated\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 I CTS?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2004-2007 Cadillac CTS equipped with the \u003cstrong\u003eLP1\u003c\/strong\u003e (2.8L) or \u003cstrong\u003eLY7\u003c\/strong\u003e (3.6L) engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve P0420 and P0430 DTCs?\u003c\/strong\u003e\u003cbr\u003e Yes, providing fuel trims and oxygen sensors function correctly, this high-efficiency substrate restores emissions efficiency above factory catalyst diagnostic thresholds.\u003c\/p\u003e\n\n\u003ch3\u003eThe Cadillac Precision Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve your luxury sport sedan's baseline refinement and balance. Precision-flanged geometry guarantees a secure seal against raw exhaust blow-by, restoring proper backpressure for uninterrupted power delivery and clean cabin air.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501718769912,"sku":"DS-E9RPKCBW9","price":221.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-cadillac-cts-2004-2007-2-8l-3-6l-left-right-1.jpg?v=1789330781","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-cadillac-cts-2004-2007-2-8l-3-6l-left-right","provider":"Performance Chip Tuning","version":"1.0","type":"link"}