2016-2019 GMC 2.8L Duramax 3” Turbo Back Exhaust Installation Guide

Introduction: Why Upgrade Your Exhaust System?

Upgrading to a 3” Turbo Back Exhaust system offers numerous benefits:

· Better Performance: Increases horsepower, torque, and reduces turbo lag.

· Improved Sound: Gives the vehicle a more aggressive exhaust tone.

· Enhanced Fuel Economy: Helps improve engine efficiency.

· Better Towing Capacity: More efficient exhaust flow allows for better towing performance.

The Turbo Back Exhaust system replaces the entire exhaust system from the turbocharger to the tailpipe, unlike the Cat-Back Exhaust system which only replaces the section from the catalytic converter back. This provides a full upgrade that enhances both performance and sound.

Pre-Installation Preparations

Before you begin, gather all the necessary tools and equipment to ensure a smooth installation process:

Required Tools and Materials

· Wrenches, screwdrivers, ratchets, and a torque wrench (to ensure correct torque for bolts).

· Jack stands, wheel chocks, and a hydraulic jack to safely lift the vehicle.

· Safety gloves, goggles, and a mechanic's creeper for ease of movement under the vehicle.

· Installation components:

o Downpipe (Part #41631)

o Intermediate pipes (Part #41632, #41633)

o Extension pipe (Part #9314) for crew cab long box models only

o Muffler (Part #7173)

o Tailpipe (Part #41635)

Step-by-Step Installation Process

Step 1: Remove Sensors and DEF Injector Connections

· Tip: Disconnect the vehicle's battery before removing sensors and DEF injector connections for added safety. This prevents any electrical issues during disconnection.

· Carefully disconnect all sensors and the DEF injector connections from the downpipe, SCR (Selective Catalytic Reduction), and Diesel Particulate Filter (DPF).

Step 2: Remove Tailpipe and DPF

· Start from the rear of the vehicle and work your way forward.

· Remove the tailpipe and Diesel Particulate Filter (DPF). This is a relatively straightforward step, as these components are located toward the rear of the exhaust system.

Step 3: Remove SCR Section (If Applicable)

· The SCR system may be complex to remove. To do so, you may need to lower the transmission cross member to allow for the removal of the SCR system in one piece.

Step 4: Remove Downpipe from Engine Bay

· Carefully unbolt the downpipe and remove it from the top of the engine bay. This may require some maneuvering and careful attention to avoid damaging surrounding parts.

Step 5: Install Downpipe (Part #41631) and Use the Factory Metal Gasket

· Important: Use the factory metal gasket to ensure a perfect seal. This prevents exhaust leaks and ensures the system’s efficiency.

· Install the new downpipe, ensuring it is aligned correctly, and fully tighten all mounting hardware.

Step 6: Install Intermediate Pipe (Part #41632)

· Ensure you use the factory rubber isolator during installation. This helps absorb vibrations and prevents noise.

Step 7: Install Second Intermediate Pipe (Part #41633)

· As with the first intermediate pipe, ensure you use the factory rubber isolator to maintain stability and reduce vibration.

Step 8: Install Extension Pipe (Part #9314) for Crew Cab Long Box Models

· If you have a crew cab long box model, install the extension pipe (Part #9314). This is not required for crew cab short box models.

Step 9: Install Muffler (Part #7173) and Tailpipe (Part #41635)

· Install the muffler and tailpipe components to complete the exhaust system. Ensure all parts are aligned properly for a secure fit.

Step 10: Tighten All Clamps Starting from the Bottom of the Downpipe

· Tip: Use a torque wrench to tighten each clamp to the manufacturer’s recommended torque specifications. This ensures a proper seal and prevents damage to the exhaust system or surrounding parts.

· Work your way from the bottom of the downpipe towards the rear of the vehicle. Tighten each clamp securely and make sure there’s enough clearance around all pipes (e.g., transmission lines, hoses, electrical wiring) to avoid contact or wear.

Post-Installation Checks and Maintenance

Check Exhaust Temperature

· After installation, start the engine and drive the vehicle for a short distance to check the exhaust temperature. This will confirm if the exhaust system is functioning properly.

Regular Maintenance Tips

· Periodically inspect the exhaust system for corrosion, cracks, or loose parts, especially if you live in areas that use road salts in winter. Clean the system to prevent carbon buildup, ensuring optimal exhaust flow.

· Regularly check for exhaust leaks and re-tighten any loose clamps.

Performance Gains and Upgrade Benefits

Upgrading to the 3” Turbo Back Exhaust system on your 2.8L Duramax brings several performance improvements:

Power and Torque Gains:

The system can increase horsepower by up to 20-30 HP and improve torque by up to 50-70 lb-ft, depending on the vehicle's overall setup.

Towing Capabilities:

The enhanced exhaust flow helps the engine run more efficiently, improving towing performance. While the stock 2.8L Duramax can tow up to 3,500 pounds, the upgraded exhaust may help improve stability and performance while towing heavier loads.

Fuel Economy and Emissions:

The system reduces backpressure, which helps improve fuel efficiency by 5-10%. It also lowers emissions, making your driving experience more eco-friendly.

Frequently Asked Questions

Q1: How much horsepower can you get out of a 2.8L Duramax with a 3” Turbo Back Exhaust?

· A1: The 3” Turbo Back Exhaust can help increase horsepower by up to 20-30 HP, depending on the overall vehicle setup and tuning.

Q2: Is GM discontinuing the 2.8 Duramax diesel?

· A2: As of now, there are no official announcements from GM confirming the discontinuation of the 2.8 Duramax. However, the 2.8L Duramax is primarily available in the Chevy Colorado and GMC Canyon, and its future depends on market demand and regulatory changes.

Q3: How much horsepower does a 2.8 Duramax have stock?

· A3: The stock 2.8L Duramax engine produces 181 horsepower and 369 lb-ft of torque.

Q4: How much can a 2.8L Duramax Turbo Diesel tow?

· A4: The 2.8L Duramax in stock form can tow up to 3,500 pounds. However, with an upgraded exhaust system, towing efficiency and vehicle stability can be improved, especially for heavier loads.

Conclusion

Upgrading your 2016-2019 GMC/Chevy 2.8L Duramax with a 3” Turbo Back Exhaust is a fantastic way to improve both performance and the overall driving experience. By following the detailed installation steps, ensuring proper maintenance, and taking advantage of the performance gains, you can enjoy better horsepower, torque, fuel efficiency, and towing capabilities.

If you're unsure about your ability to install the exhaust system correctly, it's always a good idea to have the installation performed by a professional mechanic. This ensures that the system is installed correctly and functions at its full potential.