1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your BORLA 140785 Cat-Back Exhaust System. This system is specifically designed for 2019-2023 Chevrolet Silverado 1500 and GMC Sierra 1500 models, excluding ZR2 and AT4X variants. It is engineered for vehicles with a 6.2L V8 engine, automatic transmission, and 2WD or 4WD configurations, including Extended Cab with 6' 7" Bed and Crew Cab with 5' 9" Bed, featuring an O.E. Split Rear Exit.
The BORLA 140785 system is a true dual exhaust, constructed from premium T-304 austenitic stainless steel, ensuring durability and performance. It features the signature BORLA "S-Type" sound level and includes an internal H-Pipe for enhanced performance and sound characteristics. The system is equipped with 3.5" x 3.28" bright chrome T-304 stainless steel tips.
2. Safety Information
WARNING: Proposition 65
This product, in its physical form as sold, does not present a hazard. However, operations including, but not limited to, welding, brazing, or thermal cutting can expose you to chemicals including Chromium, Nickel, Cobalt, Arsenic, Cadmium, and Lead. These chemicals are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.
Image: Example of a Proposition 65 warning label, indicating potential exposure to chemicals during certain operations.
Always wear appropriate personal protective equipment (PPE) when handling or installing exhaust components. Ensure proper ventilation if welding or cutting is required. Consult a professional for installation if you are not familiar with automotive exhaust systems.
3. Installation Overview
The BORLA 140785 Cat-Back Exhaust System is designed for bolt-on installation. However, it is a true dual design that requires cutting the factory Y-Pipe. Additionally, installation necessitates the removal of the factory valance tips.
Due to the specialized nature of this installation, professional assistance is highly recommended to ensure proper fitment, alignment, and to avoid damage to the vehicle or the exhaust system components.
3.1. Components Overview
Image: Exploded view illustrating all components of the BORLA 140785 Cat-Back Exhaust System, including pipes, muffler, and tips, along with clamps for assembly.
The system includes all necessary piping, muffler, and exhaust tips. All components are precision-manufactured using computer numerical control (CNC) techniques for accurate fitment.
3.2. Key Installation Steps (Summary)
- Securely lift and support the vehicle.
- Carefully remove the existing factory exhaust system.
- Cut the factory Y-pipe as per detailed instructions (refer to full installation guide).
- Remove factory valance tips.
- Begin installing the new BORLA system components, starting from the catalytic converter back.
- Ensure all connections are secure and properly aligned.
- Tighten all clamps and hangers to specifications.
- Verify clearance with all vehicle components.
Note: This is a summary. A detailed, step-by-step installation guide with torque specifications and precise cutting instructions is typically provided with the product or available on the manufacturer's website.
4. Operation and Sound Characteristics
The BORLA 140785 system is designed to deliver the signature BORLA "S-Type" sound level. This sound profile is characterized by a noticeable increase in exhaust volume and a more aggressive tone compared to the factory system, without the excessive drone often associated with aftermarket performance exhausts.
The internal H-Pipe within the muffler contributes to both the improved sound and performance by balancing exhaust pulses between the two banks of the engine.
Image: Close-up view of the polished 3.5" x 3.28" chrome exhaust tips, showcasing the quality finish.
After installation, allow the system to break in. The exhaust note may subtly change over the first few hundred miles as carbon deposits build up and the system components settle.
5. Maintenance
Your BORLA Cat-Back Exhaust System is constructed from high-quality T-304 stainless steel, which offers excellent corrosion resistance and requires minimal maintenance.
- Regular Cleaning: Periodically clean the exhaust tips with a non-abrasive cleaner to maintain their chrome finish.
- Inspection: Annually inspect the entire exhaust system for any loose clamps, hangers, or signs of damage. Ensure all connections remain secure.
- Corrosion: While T-304 stainless steel is highly resistant to corrosion, exposure to harsh road salts or chemicals can still affect its appearance over time. Rinse the underside of your vehicle, including the exhaust, regularly, especially in winter conditions.
6. Troubleshooting
If you experience any issues with your BORLA exhaust system, consider the following common troubleshooting steps:
- Rattling Noise: Check all hangers and clamps for tightness. Ensure the exhaust system has adequate clearance from the vehicle's chassis, suspension, and heat shields. Adjust as necessary.
- Exhaust Leak: Listen for hissing sounds, especially when the engine is cold. Inspect all connections for proper sealing. Tighten clamps or replace gaskets if a leak is detected.
- Unusual Vibrations: Verify that the exhaust system is not touching any part of the vehicle body. Check rubber hangers for wear or damage.
- Sound Changes: Minor changes in sound are normal over time. However, a sudden, significant change might indicate a leak, a loose component, or internal muffler damage.
If problems persist, it is recommended to consult a qualified automotive technician or contact BORLA customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | 140785 |
| Brand | Borla |
| Material | T-304 Austenitic Stainless Steel |
| System Type | Cat-Back, True Dual |
| Sound Level | "S-Type" |
| Tip Dimensions | 3.5" x 3.28" (Bright Chrome) |
| Vehicle Fitment | 2019-2023 Chevrolet Silverado 1500 / GMC Sierra 1500 (6.2L V8 AT 2&4WD, Ext. Cab 6' 7" Bed / Crew Cab 5' 9" Bed, O.E. Split Rear Exit) |
| Exclusions | ZR2 & AT4X models |
| Approximate Item Weight | 79 pounds |
| Product Dimensions | 66.93 x 20.87 x 12.99 inches |
8. Warranty Information
BORLA stands behind the quality and craftsmanship of its exhaust systems. The BORLA 140785 Cat-Back Exhaust System is covered by a Million-Mile Warranty. This warranty covers defects in materials and workmanship for the lifetime of the product, for the original purchaser.
For specific terms, conditions, and to register your product, please refer to the official BORLA warranty documentation included with your purchase or visit the BORLA website.
9. Customer Support
If you have any questions regarding the installation, operation, or warranty of your BORLA 140785 Cat-Back Exhaust System, please contact BORLA customer support directly. Contact information can typically be found on the BORLA website or in the packaging materials.
Image: The official BORLA Exhaust logo.
