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aFe 49C44121 This 3-inch mandrel-bent 409 stainless upgrade replaces the original muffler with a high-flow 409 stainless muffler and adapter. The factory valve and compatible rear exhaust remain. Its selected bill contains two assemblies and three clamps.
For 2019–2026 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 5.3L V8. The selected manufacturer instructions explicitly cover BOTH SINGLE AND DUAL EXHAUST EXIT layouts and retain the factory valve. Exit count does not describe valve count. Match the original muffler, valve position and adjoining pipes to the selected drawing. Custom, SSV, AT4 and Base retain the limited named years shown below rather than automatically extending to every year in the manufacturer model headline.
| Years | Make | Model | Named trim; actual 5.3L exhaust and valve layout apply |
|---|---|---|---|
| 2019-2021 | Chevrolet | Silverado 1500 | Custom |
| 2019-2026 | Chevrolet | Silverado 1500 | Custom Trail Boss |
| 2019-2026 | Chevrolet | Silverado 1500 | High Country |
| 2019-2026 | Chevrolet | Silverado 1500 | LT |
| 2019-2026 | Chevrolet | Silverado 1500 | LT Trail Boss |
| 2019-2026 | Chevrolet | Silverado 1500 | LTZ |
| 2023-2026 | Chevrolet | Silverado 1500 | PPV |
| 2019-2026 | Chevrolet | Silverado 1500 | RST |
| 2019-2021 | Chevrolet | Silverado 1500 | SSV |
| 2019-2026 | Chevrolet | Silverado 1500 | WT |
| 2019-2021 | GMC | Sierra 1500 | AT4 |
| 2019-2021 | GMC | Sierra 1500 | Base |
| 2019-2026 | GMC | Sierra 1500 | Denali |
| 2019-2026 | GMC | Sierra 1500 | Elevation |
| 2022-2026 | GMC | Sierra 1500 | Pro |
| 2019-2026 | GMC | Sierra 1500 | SLE |
| 2019-2026 | GMC | Sierra 1500 | SLT |
Verify 49C44121 against the actual engine, flange, hangers and mounting locations and applicable emissions requirements before ordering.
| Detail | Value |
|---|---|
| Brand | aFe POWER |
| Manufacturer Part Number | 49C44121 |
| System | Muffler upgrade: adapter, muffler and three clamps |
| Application | 2019–2026 Silverado/Sierra 1500, 5.3L V8; listed named years apply |
| Exit / factory valve | Single or dual exhaust EXIT; retains factory valve |
| Tubing | 3-inch mandrel-bent 409 stainless |
| Selected parts | Adapter 05-144867; muffler 05-144868; TWO 2.75-inch bands 05-41160 and ONE 3-inch 05-41055 |
| Front cut | Adjacent to front of muffler, BEHIND valve, per drawing |
| Rear cut | 2.75 inches from weld line behind muffler, per drawing |
| Original section removed after muffler | BACK half; reinstalled after fitting replacement |
| Band torque / order | 40–45 ft-lb; front toward rear |
| Recheck | ALL clamps and hardware after 50–100 miles |
| Source qualification | Generic manual heading says delete; exact part number/BOM/diagram identify MUFFLER upgrade |
| UPC | 802959603536 |
| 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. |
One adapter pipe 05-144867, one high-flow muffler assembly 05-144868, TWO 2.75-inch band clamps 05-41160 and ONE 3-inch band clamp 05-41055. The selected manual’s generic heading says “Muffler Delete Exhaust,” but its exact upgrade part number, muffler bill and illustrated assembly identify this muffled selection. No delete pipe, decorative tip, tailpipe, valve motor, sensor, filter or intake coupler is itemized.
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
One adapter pipe 05-144867, one high-flow muffler assembly 05-144868, TWO 2.75-inch band clamps 05-41160 and ONE 3-inch band clamp 05-41055. The selected manual’s generic heading says “Muffler Delete Exhaust,” but its exact upgrade part number, muffler bill and illustrated assembly identify this muffled selection. No delete pipe, decorative tip, tailpipe, valve motor, sensor, filter or intake coupler is itemized.
Do both single and dual exhaust exits fit?For 2019–2026 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 5.3L V8. The selected manufacturer instructions explicitly cover BOTH SINGLE AND DUAL EXHAUST EXIT layouts and retain the factory valve. Exit count does not describe valve count. Match the original muffler, valve position and adjoining pipes to the selected drawing. Custom, SSV, AT4 and Base retain the limited named years shown below rather than automatically extending to every year in the manufacturer model headline.
Where are the original-exhaust cuts made?Mark the front of the original muffler as close to its body as illustrated, BEHIND the factory valve. The second mark is 2.75 inches from the weld line behind the muffler. Follow the selected manual’s drawing and FORWARD arrow; retain the valve.
Which half of the original exhaust is removed?After removing the cut original muffler, remove the BACK HALF of the factory exhaust. Fit the selected replacement section and then reinstall that back half. Do not substitute another engine kit’s front-half removal procedure.
Does this replace the factory valve or include new tips?The manufacturer drawing explicitly retains the factory valve. No replacement valve motor, decorative tip, tailpipe or sensor is included in the selected bill.
What clamp torque and tightening sequence apply?Align all connections and check surrounding clearances. Start at the front and evenly tighten all clamps and fasteners. Band clamps require 40–45 ft-lb; no separate fastener torque is specified.
When are the connections rechecked?Re-tighten ALL clamps and hardware after 50–100 miles. At installation, start the vehicle and identify and repair any leaks before lowering it.
Are power, drone or intake-accessory claims verified?The manufacturer states that no CARB EO number is required. This does not waive local sound requirements or authorize changes to unrelated emissions equipment. No actual dyno or airflow chart is linked for this exact selection, and no measured drone result is supplied. Generic product-page fields marked “filter included” and “coupler included” do not add intake components to the illustrated exhaust bill.
Verify aFe 49C44121.
The manufacturer states that no CARB EO number is required. This does not waive local sound requirements or authorize changes to unrelated emissions equipment. No actual dyno or airflow chart is linked for this exact selection, and no measured drone result is supplied. Generic product-page fields marked “filter included” and “coupler included” do not add intake components to the illustrated exhaust bill.
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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