97675 Monster Exhaust 5″ System for 2017-19 & 2020-2021 Chevy/GMC 6.6L L5P Duramax

INSTALL INSTRUCTIONS
Part #s 48996, 48996-B, 49825, 49825-B, 49829, 49829-B, 48997, 48997-B

Banks Monster Exhaust® 5-inch System 2017-2019 Chevy/GMC 6.6L L5P Duramax (DCSB, DCLB, CCSB, CCLB, INCLUDING DUALLY MODELS)

2020-2021 Chevy/GMC 2500/3500 6.6L L5P Duramax (DCSB, CCSB, DCLB, CCLB, SCLB)

Please read through the following instructions thoroughly before starting your installation. If you have any questions please visit our Support Page.

Bill of Materials

General Installation Practices

Monster Exhaust System Installation

1. As a precaution, disconnect the ground of the battery (if there is more than one battery, disconnect both.)

2. Raise the vehicle and support it with properly weight rated safety stands, ramps or a commercial hoist. Follow the manufacturer’s safety precautions. Take care to balance the vehicle to prevent it from slipping or falling. When using ramps, be sure the front wheels are centered squarely on the topsides; place the transmission in the park; set the parking brake, and place blocks behind the rear wheels. 

3. Remove the NOx sensor from the over axle pipe using a 24mm wrench. For short bed models, remove the two emissions sensors using a 17mm wrench. Hang the sensors out of the way. They will be reinstalled into the Banks Monster Exhaust.

CAUTION: DO NOT WORK UNDER ANY VEHICLE SUPPORTED ONLY BY A JACK. SEVERE INJURY MAY RESULT. 

WARNING! The following step will require the use of a saw. Proper safety equipment should be used. Failure to use proper safety equipment may result in severe injury.

4. The factory exhaust pipe will be cut behind the Factory Diesel Particulate Filter (DPF). Measure from the front of the exhaust hanger towards the DPF. Take time when measuring and cutting the factory pipe to ensure the proper location and a straight cut. An improper cut will result in the poor fitment of the Banks Monster Exhaust system.

5. Remove the factory tailpipe from the vehicle by disengaging the exhaust system hanger pins from the rubber hangers using a large screwdriver or pry bar.

NOTE: Lubricating the rubber hangers with WD-40 or similar lubricant will ease the removal of the hanger pins.

6. Slide a 4” exhaust clamp onto the front of the Banks front tailpipe. Install the front tailpipe onto the cut factory pipe. Loosely snug the 4” clamp.

7. Engage the OE rubber hangers onto the hanger clamp pins. 

8. Install a 5” exhaust clamp onto the inlet of the Rear Tailpipe. Install the Rear Tailpipe onto the outlet of the Front Tailpipe. Insert the Rear Tailpipe hanger pin into the factory rubber hanger. Rotate the tailpipe until the hanger pin is parallel with the frame mounted pin. Loosely snug the 5” clamp.

NOTE: Maintain an adequate air gap clearance of one (1) inch between the exhaust and the shock absorber and between the exhaust and the spare tire.

9. Reinstall the NOx sensor into the new front tailpipe using a 24mm wrench.

10. Long bed models: Use the supplied plugs to seal the OEM ports on the Banks front tailpipe.

NOTE: The supplied sealing washer must be installed onto the larger 16mm plug before installing to prevent the plug from bottoming out.

11. Short bed models: Reinstall the two emission sensors into the new front tailpipe using a 17mm wrench.

12. Install Banks Monster tailpipe tip with exhaust band clamp on the exhaust. Keep the wrapping on until installation is complete. 

NOTICE:

The minimum distance between exhaust tip and body is one (1) inch.

13. Adjust each of the pipes to ensure that all of the hanger pins are parallel with the frame-mounted pins and that the rubber hangers are all positioned slightly forward (See Figure 5). This allows the hangers to be properly positioned once the exhaust system reaches operating temperature.

14. This image illustrates the proper location of an exhaust clamp on a tubing joint. 

15. With everything positioned properly, begin to tighten the clamps starting with the ones closest to the turbo and working your way back. Tighten all clamps to 50 ft-lbs.

16. Remove the protective covering from the tailpipe tip. 

CAUTION: The protective covering may ignite and burn if not removed prior to running the engine.

17. Your system includes two Banks Power decals designed to complement the Duramax emblems on the vehicle’s front doors. 

18. Re-connect the negative battery cable. Start the engine and listen for exhaust leaks. Tighten the exhaust clamps as necessary. Whenever possible, tack weld slip connections to prevent disengagement is recommended. The Banks Monster Exhaust installation is now complete.