FLOWMASTER 717977 Performance Exhaust System Instruction Manual
- June 13, 2024
- FLOWMASTER
Table of Contents
FLOWMASTER 717977 Performance Exhaust System
Product Information
The product is a Flowmaster performance exhaust system designed for 2019-21 GM 1500 trucks with a 5.3L engine. It includes the following parts:
- 1 Muffler Assembly (Part #: 70006-583)
- 1 Hardware Package (Part #: PK1067) – Includes various hardware components
- 2 Stainless Band Clamps (Part #: MC234BS)
- 2 Hanger Keepers (Part #: HW503)
For technical support, you can contact Flowmaster at 866-464-6553 or visit their website at www.flowmastermufflers.com.
Product Usage Instructions
- Before installing the Flowmaster performance system, read and understand the instructions provided in the manual.
- Check and inventory all parts to ensure nothing is missing. If any parts are missing, report it to the tech line before proceeding.
- To remove the stock exhaust system:
- Raise the vehicle up on a hoist or rack to a working height. If a hoist or rack is not available, use jack stands to support the vehicle.
- Cut the tailpipe at the muffler exit and disassemble hanger wires from isolators. Remove the tailpipe section from the vehicle.
- Support the muffler and disassemble wire hangers from isolators. Measure and cut the exhaust pipe 6 inches in front of the muffler, then remove the exhaust from the vehicle.
- To install the Flowmaster exhaust system:
- Remove nuts from stock and Flowmaster clamps. Apply an anti-seize compound to bolts and re-install nuts.
- Place the clamp onto the muffler and connect it to the inlet pipe. Insert wire hangers into isolators and tighten the clamp to secure the parts.
- Fit two hanger keepers onto each hanger.
- Recommended: Secure slip-fit connections with a 1-inch tack weld and spray high-temp paint over each weld to prevent rust and premature corrosion.
- Congratulations! The installation of your Flowmaster performance exhaust system is now complete.
OVERVIEW
- Take a moment to read and understand these instructions before installing your Flowmaster performance system.
NOTE: Please inventory all parts now before continuing and if necessary, report any missing items to our tech line. This will avoid potentially stranding your vehicle until any missing replacement parts arrive.
| ITM # | PART # | DESCRIPTION | QTY. |
|---|---|---|---|
| 1 | 70006-583 | Muffler Assembly | 1 |
| N/A | PK1067 | Hardware Package includes: | 1 |
| 2 | MC234BS | 23⁄4″ Stainless Band Clamp | 1 |
| 3 | HW503 | ⁄ ” Hanger Keeper | 2 |
REMOVE STOCK EXHAUST SYSTEM
Raise the vehicle up on a hoist or rack to a working height. If you don’t have access to a hoist or rack, support the vehicle with jack stands.
WARNING: Avoid serious burns! Allow your vehicle time to cool completely before touching any factory engine components.
To ease the preparation and installation of your new kit:
- Apply penetrating lubricant to mounts, bolts, and clamps before you remove them.
- Use stands as necessary to support parts as you detach them from your vehicle and again as you install new parts.
Cut tailpipe at muffler exit. Disassemble hanger wires from
isolators and remove the tailpipe section from the vehicle.
Support the muffler and disassemble wire hangers from isolators.
Measure and cut exhaust pipe 6½” in front of muffler then remove exhaust from
the vehicle.
INSTALL FLOWMASTER EXHAUST SYSTEM
Remove nuts from stock and Flowmaster clamps, apply anti-seize compound to
bolts, and re-install nuts.
NOTE: The image in this step is intended for illustrative purposes only
and may or may not accurately reflect the components included in your kit.
Place clamp (2) onto muffler (1) then connect it to inletpipe. Insert wire hangers into isolators then tighten clamp to secure parts.
Fit (×2) hanger keepers (3) onto each hanger.
Recommended: Secure slip-fit connections with a 1-inch tack weld then
spray high-temp paint over each weld to prevent rust and premature corrosion.
Congratulations, the installation of your FLOWMASTER performance exhaust system is now complete!
www.flowmastermufflers.com
Technical Support 866-464-6553
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>