OE Quality
60-Day Returns

AP Exhaust 770543 Catalytic Converter - Left
Overview of AP Exhaust Catalytic Converter 770543
The AP Exhaust catalytic converter part number 770543 is designed specifically for Cadillac CTS and STS models. This carb compliant direct-fit converter ensures proper emission control while maintaining vehicle performance.
- Compatible with Cadillac CTS and STS
- Carb compliant direct-fit catalytic converter
- Ceramic substrate material for efficient emission filtration
- Includes inlet and outlet gaskets for secure sealing
- Features one O2 sensor port for accurate monitoring
- Inlet and outlet types: 2 bolt welded flanges
- Overall length of 18.5 inches
- Executive Order D-798-9 compliant
About the AP Exhaust 8GMXV03.6053 Product Line
The 8GMXV03.6053 product line from AP Exhaust focuses on direct-fit catalytic converters that meet strict emission standards. This line is engineered to provide a precise fit for specific vehicle models, including the Cadillac CTS and STS, ensuring compliance with Executive Order D-798-9. The use of ceramic substrate material enhances durability and filtration efficiency within this product line.
Detailed Product Description
This AP Exhaust catalytic converter 770543 is a direct-fit replacement designed to meet or exceed OEM specifications for Cadillac CTS and STS vehicles. It features a ceramic substrate that effectively reduces harmful emissions while maintaining exhaust flow. The converter includes both inlet and outlet gaskets to ensure a tight seal and prevent leaks. The inlet and outlet connections utilize 2 bolt welded flanges, with the outlet flange including a gasket stub for proper installation. Additionally, the unit has one O2 sensor port to accommodate the vehicle’s oxygen sensor, which is critical for engine management and emissions control. With an overall length of 18.5 inches, this catalytic converter fits precisely within the exhaust system layout of the specified Cadillac models.
Common Applications and Issues Addressed
- Replacement for faulty or clogged catalytic converters on Cadillac CTS and STS
- Restores proper emission control to meet regulatory standards
- Eliminates exhaust leaks caused by damaged gaskets or flanges
- Supports accurate O2 sensor readings for engine performance
- Helps resolve check engine light issues related to catalytic converter failure
Installation Notes and Tips
This catalytic converter is designed as a direct-fit replacement, simplifying installation on compatible Cadillac CTS and STS models. Ensure the existing exhaust flanges and O2 sensor port align with the 2 bolt welded flange design. The included inlet and outlet gaskets should be installed to prevent exhaust leaks. No additional hardware is included, so retain or source necessary bolts and fasteners separately. Proper torque specifications should be followed to avoid flange damage.
Quality Assurance and Compliance
The AP Exhaust catalytic converter 770543 complies with Executive Order D-798-9, ensuring it meets California emission standards. The ceramic substrate material provides reliable filtration and durability. While specific warranty details are not provided, AP Exhaust products typically adhere to industry quality standards for direct-fit emission components.
| Brand | AP Exhaust |
| Part Number | 770543 |
| Position | BGMXV03.6053, Left |
| Executive Order | D-798-9 |
| Inlet Gasket | Yes |
| Inlet Hardware | None |
| Inlet Type A | 2 bolt welded flange |
| O2 Sensor Ports | 1 |
| Outlet Gasket | Yes |
| Outlet Hardware | None |
| Outlet Type A | 2 bolt welded flange w/ gasket stub |
| Overall Length (IN) | 18.5 |
| Substrate Material | Ceramic |
| Type | Carb compliant direct-fit |
This part fits 11 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2011 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; BGMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; BGMXV03.6053; BGMXV03.6053 |
| 2011 | Cadillac | STS | 3.6L | V6 | Left | Direct Fit - California; BGMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; BGMXV03.6053; BGMXV03.6053 |
| 2010 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; AGMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; AGMXV03.6053; AGMXV03.6053 |
| 2010 | Cadillac | STS | 3.6L | V6 | Left | Direct Fit - California; AGMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; AGMXV03.6053; AGMXV03.6053 |
| 2009 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; 9GMXV03.9148; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 9GMXV03.9148; 9GMXV03.9148 |
| 2009 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; 9GMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 9GMXV03.6053; 9GMXV03.6053 |
| 2009 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; 9GMXJ03.9148; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 9GMXJ03.9148; 9GMXJ03.9148 |
| 2009 | Cadillac | STS | 3.6L | V6 | Left | Direct Fit - California; 9GMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 9GMXV03.6053; 9GMXV03.6053 |
| 2008 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; 8GMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 8GMXV03.6053; 8GMXV03.6053 |
| 2008 | Cadillac | CTS | 3.6L | V6 | Left | Direct Fit - California; 8GMXB03.6148; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 8GMXB03.6148; 8GMXB03.6148 |
| 2008 | Cadillac | STS | 3.6L | V6 | Left | Direct Fit - California; 8GMXV03.6053; ALL; Legal Note: In Compliance with California Emissions Requirements; EO Number : D-798-10; 8GMXV03.6053; 8GMXV03.6053 |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.