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Dimension-matched 4-inch performance muffler
The aFe 49-91002 MACH Force-Xp muffler uses brushed-finish 409 stainless steel, a straight-through perforated core and heat-resistant packing. Its current exact specifications give 4-inch ID inlet/outlet, 30-inch overall length and 8-inch body diameter.
Key Features
- Brushed-finish 409 stainless steel construction.
- Straight-through perforated core with heat-resistant packing.
- 4-inch inside-diameter inlet and outlet.
- 30-inch overall length and 8-inch body diameter.
- 5-inch embossed aFe POWER signature logo.
- Manufacturer describes a deep sound on acceleration and smooth sound at idle; actual sound depends on the complete exhaust.
Fitment
| Application | Exhaust | Dimensions | Requirements |
|---|---|---|---|
| Specification-matched | Compatible exhaust requiring a muffler | 4-inch ID inlet/outlet; 30-inch overall length; 8-inch body diameter | Verify mating pipe dimensions, insertion overlap, installed span, support and body clearance |
Specifications
| Detail | Value |
|---|---|
| Brand | aFe POWER |
| Manufacturer Part Number | 49-91002 |
| Product line | MACH Force-Xp |
| Product type | Muffler |
| Material / finish | Brushed-finish 409 stainless steel; 409 stainless steel grade |
| Inlet / outlet | 4-inch ID / 4-inch ID |
| Overall length | 30 inches |
| Body diameter | 8 inches |
| Body length | Separate body-only length not established by current exact page |
| Internal construction | Straight-through perforated core and heat-resistant packing |
| Logo | 5-inch embossed aFe POWER signature |
| Hardware | No included clamp count or hardware package established |
| Torque / cut / recheck | No exact manual or numeric requirements linked |
| UPC | 802959499047 |
What's Included
- One MACH Force-Xp 409 stainless steel performance muffler.
- 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 49-91002?A specification-matched MACH Force-Xp performance muffler with a straight-through perforated core and heat-resistant packing. It is a muffler section, not a muffler-delete pipe or complete cat-back exhaust.
Which stainless steel grade is specified?The current exact manufacturer specifies brushed-finish 409 STAINLESS STEEL. This selection is 409 stainless steel; it is not the separate aluminized-steel or 304-stainless model.
Which dimensions must match?Match the 4-inch ID inlet and outlet, 30-inch overall length and 8-inch body diameter. Confirm insertion overlap, support and surrounding clearances. A separate body-only length is not established by the current exact page.
What is inside the muffler?A straight-through perforated core with heat-resistant packing, as described by the manufacturer. No packing composition, replacement interval, internal chamber count or numeric flow result is supplied.
What is included?One MACH Force-Xp 409 stainless steel performance muffler is identified and pictured. No included clamp count, separate gasket, hanger, decorative tip, tailpipe, filter or intake coupler is established by the exact page. Determine the connection hardware needed for the actual exhaust.
Does installation require cutting or welding?That depends on the existing exhaust connections and removable muffler span. No exact installation manual or cutting measurements are linked for this selection. Confirm the installation method before disassembly; no named-vehicle bolt-on fitment is established.
What torque or recheck interval applies?The exact manufacturer page provides no numeric torque, tightening sequence or recheck mileage. Use the applicable instructions for the chosen connection hardware and have the actual assembly assessed by an exhaust installer.
Are sound, power and emissions results guaranteed?The manufacturer describes a deep acceleration tone and smooth idle sound. No measured noise/drone result or actual dyno/flow chart is linked, so no numeric gain or drone-free result is promised. The exact page states no CARB EO number is required; local sound and usage requirements still apply.
Installation Instructions
- Measure both mating pipe connections, insertion overlap, installed muffler span, exhaust support and surrounding clearances. Match the 4-inch ID connections, 30-inch overall length and 8-inch body diameter before disassembly.
- Compare the supplied muffler with the planned installation and determine required connection hardware. Allow the exhaust to cool, wear suitable eye and hand protection and support the vehicle and exhaust appropriately.
- Have a qualified exhaust installer determine whether cutting, welding or additional fabrication is necessary. The exact manufacturer page provides no selected installation manual, cut measurement or guaranteed direct-fit named vehicle application.
- Fit and align the muffler using the applicable connection-hardware instructions. No numeric torque, tightening sequence, recheck mileage, battery-disconnection, sensor-transfer or valve/coding procedure is specified by the exact product page.
The manufacturer states no CARB EO number is required. This does not waive sound or usage requirements or authorize changing unrelated emissions equipment. Generic product-page fields for an included filter and coupler do not add intake parts to this muffler.
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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