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Dimension-matched 4-inch muffler replacement
The aFe 49-91004 MACH Force-Xp pipe replaces a compatible 4-inch inlet/outlet muffler in a factory or performance exhaust. Its 409 stainless construction, 4-inch inside-diameter connections and 30-inch overall length define the documented replacement section.
Key Features
- 409 stainless steel tubing.
- 4-inch ID inlet and outlet.
- 30-inch overall length.
- Replaces a compatible 4-inch inlet/outlet muffler section.
- Manufacturer describes an aggressive exhaust tone after muffler removal.
Fitment
| Application | Exhaust | Connection | Requirements |
|---|---|---|---|
| Specification-matched | Compatible factory or performance 4-inch exhaust | 4-inch ID inlet/outlet; 30-inch overall pipe length | Verify mating pipe outside diameter, insertion overlap, installed span, support and clearances |
Specifications
| Detail | Value |
|---|---|
| Brand | aFe POWER |
| Manufacturer Part Number | 49-91004 |
| Product line | MACH Force-Xp |
| Product type | Muffler Delete Pipes |
| Material | 409 stainless steel |
| Inlet / outlet | 4-inch ID / 4-inch ID |
| Overall length | 30 inches |
| Application | Dimension-matched muffler replacement section |
| Hardware | No clamp quantity or hardware package established by exact page |
| Weld / torque / interval | Not specified by the exact manufacturer page |
| UPC | 802959499061 |
What's Included
- One 409 stainless steel muffler-delete pipe.
- Exact page does not establish an included clamp count or hardware package.
About aFe Power
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
Related Parts
FAQ
What is the 49-91004?A specification-matched MACH Force-Xp muffler-delete pipe made from 409 stainless steel. It replaces a compatible 4-inch inlet/outlet muffler section; it is not a complete cat-back exhaust.
Which dimensions must match?The manufacturer lists 4-inch ID inlet and outlet and 30-inch overall length. Compare mating pipe outside diameters, insertion overlap, removable muffler span, support and clearances. The 30-inch figure is overall pipe length, not an independent straight-body length.
What is included?One 409 stainless steel muffler-delete pipe is identified and pictured. The selected page does not establish a supplied clamp count or a hardware package. Do not assume the clamps supplied with a different delete pipe are included. No muffler, decorative tip, tailpipe, filter or intake coupler is established.
Does it fit every truck with a 4-inch exhaust?No. Nominal system size alone does not establish the actual connection fit, installed length, support or underbody clearance. This is a dimension-matched application rather than a verified list of named vehicles.
Is it TIG welded or supplied with a polished exhaust tip?The exact page specifies 409 stainless tubing and a muffler-delete pipe. It does not identify a weld process or a separate decorative tip. No TIG-welded assembly or tip finish is promised.
Does installation require cutting or welding?That depends on the existing exhaust and the section being removed. No installation manual or cutting measurements are linked for this exact pipe. Have the actual connections and installation method assessed before disassembly.
Are sound, horsepower or torque gains guaranteed?The manufacturer describes an aggressive exhaust note, but provides no measured sound or drone result and no actual dyno or airflow chart for this selection. No numeric power increase or drone-free result is established.
What torque, service interval and emissions information apply?The exact page supplies no numeric clamp torque, tightening sequence or recheck mileage. Use the applicable instructions for the actual connection hardware. The manufacturer states no CARB EO number is required; local sound and usage requirements still apply.
Installation Instructions
- Measure both actual mating pipe connections, insertion overlap, removable muffler span, support and surrounding clearances before ordering or disassembly.
- Compare the selected pipe with the planned installation and determine what connection hardware is required. The exact page does not establish that clamps are supplied. Allow the exhaust to cool and use appropriate vehicle and exhaust support.
- Have a qualified exhaust installer determine whether cutting, welding or additional fabrication is needed. No selected installation manual, numeric cutting dimension or guaranteed direct-fit vehicle application is supplied.
- Fit and align the replacement section using the applicable connection-hardware instructions. No manufacturer torque, tightening sequence, recheck mileage, battery-disconnection or sensor/valve procedure is specified for this exact pipe; do not substitute instructions from another kit.
The manufacturer states no CARB EO number is required. This does not waive sound or usage requirements or authorize changing unrelated emissions equipment.
California Proposition 65 warning: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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