FLOWMASTER FORD F-150 Force II Exhaust System Instruction Manual
- June 13, 2024
- FLOWMASTER
Table of Contents
FLOWMASTER FORD F-150 Force II Exhaust System Instruction Manual
OVERVIEW
Take a moment to read and understand these instructions before installing your Flowmeter 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 | 26851S | Inlet Pipe | 1 |
| 2 | 26851S | Extension Pipe | 1 |
| 3 | 815430-579 | Muffler Assembly | 1 |
| N/A | PK1074 | Hardware Package includes: | 1 |
| 4 | SF059 | Flange | 1 |
| 5 | MC300BS | 3″ Stainless Band Clamp | 2 |
REMOVE STOCK EXHAUST SYSTEM:
Raise vehicle up on a hoist or rack to working height. If you don’t have access to a hoist or rack, support vehicle with jack stands.
WARNING: Avoid serious burns! Allow your vehicle time to cool completely before touching any factory engine components
To ease 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 tailpipe section from vehicle.
Support muffler and disassemble wire hangers from isolators. Remove and retain
(x2 ea.) flange nuts and bolts, disconnect inlet pipe and remove exhaust
system.
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 components included in your kit.
If your vehicle falls within the specifications listed below, apply the corresponding modifications or assembly combinations to this kit to ensure it will install properly.
WHEEL BASE| BODY STYLE| BED LENGTH| INLET ASSY:|
MODIFICATION
---|---|---|---|---
141″| Regular Cab| 8′| Inlet Pipe only| Trim 4″ from inlet pipe
145″| Super Crew| 5’5| Inlet Pipe only| None
145″| Super Cab| 6’5| Inlet Pipe only| None
157″| Super Crew| 6’5| Inlet+ Extension| Trim 6″ from extension pipe
163″| Super Cab| 8′| Inlet+ Extension| None
Place flange (4) on inlet pipe (1) then connect assembly to head pipe. Fasten
flanges with (x2 ea.) nuts and bolts (removed step 4) just enough to hold
parts. Reference diagram to orient inlet pipe properly
If applicable, place clamp (5) onto extension (2) then connect it to inlet
pipe. Tighten clamp just enough to allow for adjustment.
Remove muffler hanger mount, slide it onto muffler (3) and place clamp (5)
onto muffler. Connect it to inlet/ extension, insert hanger into isolator then
fasten hanger mount into place on frame.
Adjust exhaust components for fit; maintaining 1/2″ clearance and compensating for suspension, travel and vibration then tighten all clamps.
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!
Installation Diagram
818118 2021-22 FORD F-150 2.7T, 3.5T & 5.0L ENGINE
Rev 02/18/22
www.flowmastermufflers.com
Rev 02/18/22 Technical Support
866-464-6553
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