Catalytic Converter for Cadillac CTS (2004-2007) 2.8L 3.6L Left & Right

Direct-Fit Catalytic Converter Set for 2004-2007 Cadillac CTS

What it Does: The Left & Right Catalytic Converter set restores factory emissions efficiency and corrects exhaust backpressure on the 2004-2007 Cadillac CTS without custom exhaust fabrication.

The Stock Cadillac CTS Catalytic Degradation

On the Sigma I platform CTS, the factory catalytic assemblies frequently suffer from internal ceramic washcoat erosion and thermal fracture due to extended heat cycles from the GM High Feature V6 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.

The Engineering Solution

This 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.

Technical Specifications

Compatibility

• 2005-2007 Cadillac CTS Base Sedan 4-Door 2.8L 2792CC V6 GAS DOHC Naturally Aspirated
• 2004-2007 Cadillac CTS Base Sedan 4-Door 3.6L 3564CC V6 GAS DOHC Naturally Aspirated

Frequently Asked Questions

Does this fit the Sigma I CTS?
Yes, this is a direct fit for the 2004-2007 Cadillac CTS equipped with the LP1 (2.8L) or LY7 (3.6L) engine.

Will this resolve P0420 and P0430 DTCs?
Yes, providing fuel trims and oxygen sensors function correctly, this high-efficiency substrate restores emissions efficiency above factory catalyst diagnostic thresholds.

The Cadillac Precision Standard

Preserve 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.