FLOWMASTER 70006-603 Exhaust Kit Instruction Manual
- June 13, 2024
- FLOWMASTER
Table of Contents
Installation Instructions
718141 2022-2023 Toyota Tundra
With 3.4L Engine
2 or 4-Wheel Drive
70006-603 Exhaust Kit
Installation requires cutting the OEM exhaust and basic mechanical skill.
If this job is beyond your abilities, seek the services of a qualified
technician.
If you do not understand any part of these instructions, please call Flowmeter
Technical Support at 866-464-6553 for
assistance.
Apply penetrating oil generously to clamps, fasteners, pipes, and hanger rods
for ease of disassembly.
REVIEW THE INSTRUCTIONS & VERIFY THE KIT CONTENTS
Take a moment to read and understand these instructions before installing your
Flowmeter exhaust kit.
| ITEM# | Part # | Description | Qty. |
|---|---|---|---|
| 1 | 70006-603 | Muffler Assembly | 1 |
| 2 | MC313BS | 3.125” Band Clamp | 1 |
Use the parts drawing and list to verify your kit’s contents. In the unlikely
event that any parts are missing, please contact Flowmeter Technical Support
for replacements.
Vehicle Compatibility
Model Year: 2022-2023
Make: Toyota Tundra
Engine: 3.4L V6 Twin Turbo
164.6” Wheelbase
157.7” Wheelbase
145.7” Wheelbase
All trim levels
BEFORE STARTING:
Raise the vehicle a minimum of 18 inches. A floor hoist is ideal. If no hoist
is available, we strongly urge the use of axle stands as a safety measure.
Please read and understand these instructions and disclaimer in their entirety
before attempting installation.
CAUTION! WORK ONLY ON A SOLID, LEVEL SURFACE. USE JACKS /JACK STANDS OF
SUFFICIENT CAPACITY TO LIFT AND SUPPORT YOUR VEHICLE. NEVER WORK UNDER A
VEHICLE SUPPORTED BY A FLOOR OR BUMPER JACK.
Removing the OEM Exhaust. “Cutting the OEM Exhaust is Required”
-
Cut the OEM exhaust 1” from the weld on the factory Y-pipe just before the muffler assembly and support the Y-pipe. Fig.1
NOTE: This dimension will be the same regardless of the vehicle wheelbase.
-
Deburr the remaining pipe where it was cut inside and out using a rotary or hand file.
-
Remove the muffler and tailpipe by first removing the tailpipe section at the flange, then remove the muffler. The Y-pipe will remain on the vehicle.
NOTE: It may be necessary to lower the spare tire to remove the tailpipe. -
Remove the (x2) muffler hanger isolators and the tailpipe isolator (x1) before the rear axle and set aside for re-use.
-
Remove the remaining tailpipe isolators.
INSTALL YOUR FLOWMASTER EXHAUST SYSTEM
Before installing clamps in the following steps, remove their nuts, apply anti-seize compound to the bolt threads, and re-install the nuts.
- Install the supplied MC313BS band clamp (2) on to the expanded inlet of the 718141 muffler assembly (1) . Fig.2
- Install the muffler assembly (1) onto the OEM Y-pipe until the pipe is fully inserted into the slip joint. Make sure the assembly is supported.
- Apply spray lube to the (x2) rubber muffler and (x1) tailpipe isolators.
- Reinstall the rubber muffler hanger isolators and tailpipe isolator on to the muffler assembly Fig.2
- Install the rubber isolators on to the vehicle hanger rods. (HA1), (HA2), (HA3).
- Check for proper alignment and tighten the MC313BS band clamp (2).
Enjoy
Your FlowFX Exhaust! 
718141
www.flowmastermufflers.com
Rev 08/01/23
Technical Support 866-464-6553
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>