Quick Answer: 2011–2019 Ford 6.7 Cab & Chassis Exhaust Install
For a 2011–2019 Ford 6.7L Cab & Chassis 4-inch downpipe-back route, start with the chassis and body layout. Fit the front and intermediate pipes loosely, hang the rear over-axle pipe and tailpipe, then position the muffler. Measure the wheelbase extension between these supported assemblies before trimming and final tightening.
Before you start: Check the route under your service body or flatbed before removing the exhaust. Use the Cab & Chassis illustrations to compare the front connection, rear supports and wheelbase-dependent extension: 2011–2019 Ford 6.7L Cab & Chassis Exhaust Installation PDF.
Why Cab & Chassis Fitment Needs A Different Check
A service body or flatbed can block an exhaust route that looks clear on a pickup. Walk the path under your actual truck before choosing the kit or releasing a single flange.
You need room to remove the old pipes as well as fit the new ones. Record the wheelbase, hanger locations and any body equipment beside the route. Those details are more useful than pipe size alone.
U.S. emissions rules prohibit tampering with certified controls. A race-use label alone does not establish an exemption.
Match Your Cab & Chassis Layout
Tip — Fuel-tank configuration: The related Flo-Pro chassis reference specifies a rear center-mounted fuel tank. That describes one route, not every chassis. Its older document covers 2011–2017 and does not by itself confirm 2018–2019 fitment; compare the linked manual and actual later-year truck connections.
| Vehicle or layout check | What applies here |
|---|---|
| Truck covered | 2011–2019 Ford 6.7L Powerstroke Cab & Chassis. |
| Replacement route | 4-inch downpipe-back route matched to the actual chassis. |
| Check before removal | Wheelbase, fuel-tank position, rear supports, work-body equipment and outlet path. |
| Extension | Measure using the supported front pipes, rear assembly and actual muffler. |
| Pickup parts | A shared engine and pipe size do not establish the same rear route. |
Before You Remove Anything: This guide covers the 2011–2019 6.7L Powerstroke Cab & Chassis 4-inch route illustrated in the linked manual. Check wheelbase, fuel-tank position, body equipment, rear support points and outlet. Pickup rear pipes are not automatically interchangeable with a chassis-cab layout.
Cab & Chassis Parts From Front Flange To Exit
| Component name | Illustrated manual reference | How to identify or fit it |
|---|---|---|
| Front flange pipe | 31112NB in the steps | The packing artwork shortens the label to 3112NB; this is the one front section. |
| Intermediate pipe | 31113NB | Connect loosely behind the front flange pipe. |
| Wheelbase extension | 40054 | Measure using the installed front and rear positions. |
| Muffler | 6185 | Use the actual inlet/outlet geometry when locating the center gap. |
| Over-axle pipe / tailpipe | 31125 / 30827 | Match the chassis route and original rubber mounts. |
Use the shapes, pipe ends and welded supports in this drawing to match the components listed above.
Tools And Access For The Actual Chassis
| Tool Or Equipment | What You Need It For |
|---|---|
| Front flange and clamps | Sockets and wrenches matched to the actual hardware; sizes are not specified in ES08793. |
| Work-body access | Approved lifting equipment and exhaust stands suited to the actual chassis. |
| If trimming is required | Measuring tools and the correct pipe-cutting equipment; first confirm the route and overlap. |
Start with a cold exhaust. Support the truck by the approved method and support each heavy pipe before release. Never work under a jack alone.
Phase 1: Check Access And Remove The Supported Stock System
Installer Tip: Check the work-body route before marking the extension. Shortening a pipe will not prove that a blocked route is the right application.
Step 1: Check The Chassis And Work Body
Check the actual wheelbase, fuel-tank position and route under the work body. Note toolboxes, body mounts, hoses and the rear outlet path. Compare the replacement rear bends with those obstacles before releasing the stock exhaust. A shared engine and diameter do not prove a pickup rear route fits this chassis.
Step 2: Remove The Supported Stock Sections
Support the cold filter and rear assemblies. Label and release their electrical and pressure-line connections, then open the downpipe flange and downstream clamps. Free the rods from the rubber mounts before lowering the sections. If intact tailpipe removal needs axle droop, use a rated lifting/support method that safely allows it; never rely on a jack alone.
Phase 2: Set The Front And Center Route For This Wheelbase
Step 3: Fit The Front Flange Pipe Loosely
Fit the front flange pipe to the retained downpipe and start the matching hardware by hand. Keep the joint adjustable and the free end supported. Match the actual flange and bend; the two front labels in the manual refer to the same position, not two successive pipes.
Step 4: Dry-Fit The Center And Extension
Add the intermediate pipe and trial center extension without cutting. The rear bend, tailpipe and actual muffler must be in their normal supported positions before the final measurement. Measure the end-face gap and add each actual slip-joint insertion once. Leave the center loose while hanging the rear route.
Phase 3: Hang The Rear Route And Check The Work Body
Step 5: Hang The Over-Axle Pipe And Tailpipe
Hang the chassis-specific over-axle pipe and tailpipe in their matching stock rubber mounts. Set the outlet clear of the work body and nearby equipment. Keep the joints loose so the actual muffler can be positioned ahead of the rear bend.
Set the Muffler Position Before the Wheelbase Cut
Fit and support the muffler ahead of the over-axle pipe, following any direction marking. With the rear supports seated and outlet clear of the work body, return to measure the center extension.
Cut only an allowed plain end and remove burrs. Wheelbase sets the length question; fuel-tank and body clearance set the route question. An extension cut cannot move an incompatible rear bend around a tank.
Step 6: Check The Complete Rear Route
Check the center extension, axle route and exit together. If the work body blocks the pipe, confirm the application before modifying anything. Do not make a pickup layout fit by trial and error.
Installed rear exhaust exit.
Step 7: Tighten From Front To Rear
With the route supported and aligned, tighten the front flange and work back. Recheck the rubber mounts and body clearance as you go. Use the right specs for the supplied hardware.
Troubleshoot A Work-Body Or Wheelbase Conflict
| What you find | What to check before changing parts |
|---|---|
| Rear bend conflicts with a fuel tank | Check the tank-position requirement and chassis route. Center trimming will not move the rear bend around a different tank. |
| Extension is long with the rear hanging down | Seat and support the rear mounts and muffler before measuring. A hanging assembly changes the gap. |
| Tailpipe hits body equipment | Check the outlet route before final tightening. Do not use a loaded rubber mount to hold the pipe against an obstruction. |
Final Check Along The Work Body And Chassis
- Chassis route: Fuel-tank position, work-body equipment and outlet checked on the actual truck.
- Center length: Extension measured with the rear route and actual muffler supported; each joint engagement included once.
- Rear mounts: Over-axle pipe and tailpipe sit in their matching rubber supports clear of body equipment.
- Tightening pass: Front flange, body clearance and rear support positions remain correct as joints are secured.
Before use, have the joints checked for leaks with the proper shop method. Do not run the engine in a closed space. If there is a new rattle, soot trace or loose support, let the exhaust cool and correct the cause. Follow the supplied hardware maker’s heat-cycle recheck instructions.
A service body needs the dedicated Cab & Chassis route. The link selects Dp-Back Cab&Chassis / 4" / 2011-2019. Compare its route with your body equipment before ordering. View Dp-Back Cab&Chassis / 4" / 2011-2019
[[product-recommend:1]]Before Use: Calibration And Leak Checks
Arrange the compatible calibration and any device or service your exact package needs before use. Exhaust fitting does not include ECU programming. Diagnose warning lights, reduced power or leaks before operating the truck.
Conclusion
The full route must clear the work body with every hanger seated. Measure the extension from the supported route, not an open gap under the truck. Final tightening should not move a pipe into body equipment.
For related parts on the same platform, browse 2011–2019 6.7L Powerstroke parts.
Choose The Cab & Chassis Route
Use the vehicle and option table above to match your build. The collection includes other pipe sizes and layouts, so keep the exact option name with your parts list.
References
Flo-Pro Cab & Chassis routing reference — Cross-check the applicable support and routing notes; do not transfer another system’s cut lengths or hardware settings.
- SPEtuner: "ES08793 illustrated installation instructions." Available from SPEtuner installation PDF.
- U.S. Environmental Protection Agency: "EPA Fact Sheet re Aftermarket Defeat Devices and Tampering." Available from U.S. Environmental Protection Agency.
- Cover photo: "Bull-Doser: "Ford F-350 Super Duty Dump Truck P473.jpg — Public domain. Layout added; vehicle photo retained." Available from Cover photo: Bull-Doser.
FAQ
Q: Can I Use A Pickup-Bed Kit On This Cab & Chassis Truck?
A: Do not assume so. This guide uses a Cab & Chassis route with its own hangers and wheelbase fit.
Q: Which Rear Parts Must Be Positioned Before Measuring?
A: Hang the over-axle pipe and tailpipe, then fit and support the actual muffler ahead of them. Their installed position sets the rear end of the center gap.
Q: How Much Should I Cut From The Wheelbase Extension?
A: Measure the end-face gap with both assemblies supported. For two slip joints, add the actual insertion at each end once. Trim only an allowed plain end; there is no one cut for every chassis.
Q: What If The Work Body Touches The Pipe?
A: Check rear-pipe rotation and supports, then compare the route with the body and fuel-tank layout. Do not trim the center or bend safety lines to hide an incompatible rear route.
Q: Which End Gets Tightened First?
A: The PDF starts at the front flange and works toward the rear after alignment.
Q: What Should I Record Before Removing The Chassis Exhaust?
A: Record the wheelbase, front flange, rear supports, fuel-tank location and any body equipment beside the route. Photograph the original positions before release.
Lars
Diesel Performance Engineer | 15+ Years Experience
"Empower Your Beast: Run Cooler, Pull Harder, Last Longer."
