aFe 49-04093 ATLAS uses 3-inch mandrel-bent STEEL tubing with a black finish and thermal header tape for the 2001-2004 LB7 Duramax. Its heavy-duty inlet flange is CNC machined, the outlet uses a V-band flange, and current manufacturer explicitly includes a turbine gasket.
2001-2004 Chevrolet Silverado and GMC Sierra 2500/3500 applications with 6.6L LB7 Duramax turbodiesel. A 2004 calendar-year match requires the LB7 engine and matching turbo/exhaust interface; it does not include the later 2004.5 LLY by inference. Original named-grade year bounds are retained, with Silverado 3500 LT 2001-2004 and Sierra 3500 SL 2001-2002 restored from the exact current retailer table. No van, gasoline, later engine or modern HD-model mapping is inferred.
| Years | Make | Model | Named grade; actual LB7 engine and original turbo/exhaust interface required |
|---|---|---|---|
| 2001-2004 | Chevrolet | Silverado 2500 HD | Base |
| 2001-2004 | Chevrolet | Silverado 2500 HD | LS |
| 2001-2004 | Chevrolet | Silverado 2500 HD | LT |
| 2004 | Chevrolet | Silverado 2500 HD | WT |
| 2001-2004 | Chevrolet | Silverado 3500 | Base |
| 2001-2004 | Chevrolet | Silverado 3500 | LS |
| 2001-2004 | GMC | Sierra 3500 | SLE |
| 2001-2004 | GMC | Sierra 3500 | SLT |
| 2004 | GMC | Sierra 3500 | WT |
| 2004 | Chevrolet | Silverado 3500 | WT |
| 2002-2004 | GMC | Sierra 2500 HD | Base |
| 2001-2002 | GMC | Sierra 2500 HD | SL |
| 2001-2004 | GMC | Sierra 2500 HD | SLE |
| 2001-2004 | GMC | Sierra 2500 HD | SLT |
| 2003-2004 | GMC | Sierra 2500 HD | WT |
| 2002-2004 | GMC | Sierra 3500 | Base |
| 2001-2004 | Chevrolet | Silverado 3500 | LT |
| 2001-2002 | GMC | Sierra 3500 | SL |
Verify 49-04093 against the actual engine, flange, hangers and mounting locations and applicable emissions requirements before ordering.
| Detail | Value |
|---|---|
| Brand | aFe POWER |
| Manufacturer Part Number | 49-04093 |
| System | ATLAS turbo downpipe for LB7 Duramax |
| Tube diameter / material | 3-inch mandrel-bent STEEL; no stainless grade or TIG-weld specification verified |
| Finish / insulation | Black finish with high-temperature thermal header tape |
| Flanges | CNC-machined heavy-duty inlet flange; V-band outlet |
| Gasket | Turbine gasket included; separate service number not provided |
| Engine | 2001-2004 6.6L LB7 turbodiesel; later LLY not inferred |
| Complete bill | Not located; additional clamp/bolt/hardware inclusion unverified |
| Installation / torque | Exact full procedure, cutting/reuse requirements, torques and recheck interval unverified |
| Performance evidence | No actual dyno or bench-flow chart is linked for this exact selection. Manufacturer descriptions of flow, throttle response, insulation and spool behavior do not independently establish numeric horsepower, torque, spool-time, EGT or underhood-temperature changes. |
| EO qualification | Current manufacturer cites CARB EO D-550-48 and says SOME OR ALL listed applications are exempt. The indexed official Exhibit A names this exact part for 2001-2004 LB7 Silverado/Sierra 2500/3500. The full order and exact exclusions remain held after an earlier access challenge, so the headline does not certify every vehicle or modified configuration. |
| UPC | 802959610268 |
| 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 ATLAS turbo-downpipe assembly in 3-inch mandrel-bent STEEL with black finish and high-temperature thermal header tape. Current exact manufacturer explicitly includes a TURBINE GASKET; it supplies no separate gasket service number. The CNC-machined heavy-duty inlet flange and V-band outlet flange are described by the manufacturer. A full separately numbered bill and exact installation manual were not located, so additional clamps, bolts, sensors, wiring or hardware are not certified as supplied. This is a wrapped black downpipe, not a polished decorative exhaust tip or a verified stainless-steel/TIG-welded assembly.
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 ATLAS turbo-downpipe assembly in 3-inch mandrel-bent STEEL with black finish and high-temperature thermal header tape. Current exact manufacturer explicitly includes a TURBINE GASKET; it supplies no separate gasket service number. The CNC-machined heavy-duty inlet flange and V-band outlet flange are described by the manufacturer. A full separately numbered bill and exact installation manual were not located, so additional clamps, bolts, sensors, wiring or hardware are not certified as supplied. This is a wrapped black downpipe, not a polished decorative exhaust tip or a verified stainless-steel/TIG-welded assembly.
Which engine and years fit?2001-2004 Chevrolet Silverado and GMC Sierra 2500/3500 applications with 6.6L LB7 Duramax turbodiesel. A 2004 calendar-year match requires the LB7 engine and matching turbo/exhaust interface; it does not include the later 2004.5 LLY by inference. Original named-grade year bounds are retained, with Silverado 3500 LT 2001-2004 and Sierra 3500 SL 2001-2002 restored from the exact current retailer table. No van, gasoline, later engine or modern HD-model mapping is inferred.
What material and finish are verified?Current exact manufacturer specifies 3-inch mandrel-bent STEEL with BLACK FINISH and HIGH-TEMPERATURE THERMAL HEADER TAPE. A stainless grade, TIG-welded construction or polished decorative tip is not verified.
Is a turbine gasket included?YES. Current exact manufacturer explicitly states that a turbine gasket is included with the heavy-duty inlet-flange arrangement. Its separate service number is not supplied; the complete additional-hardware bill remains unverified.
Are the exact installation steps available?The current exact manufacturer page did not link an instruction manual, and no exact full procedure was located. Confirm the boxed revision and obtain the correct instructions before disassembly. Access steps, clamp reuse and cutting/welding requirements remain unverified.
What torque or mileage recheck applies?Numeric torques and mileage-based rechecks are not verified without the exact manual. No related-engine downpipe values, wheel-nut check or generic exhaust-clamp interval is substituted.
Are numeric performance gains measured?No actual dyno or bench-flow chart is linked for this exact selection. Manufacturer descriptions of flow, throttle response, insulation and spool behavior do not independently establish numeric horsepower, torque, spool-time, EGT or underhood-temperature changes.
Does the EO certify every vehicle?Current manufacturer cites CARB EO D-550-48 and says SOME OR ALL listed applications are exempt. The indexed official Exhibit A names this exact part for 2001-2004 LB7 Silverado/Sierra 2500/3500. The full order and exact exclusions remain held after an earlier access challenge, so the headline does not certify every vehicle or modified configuration.
Verify aFe 49-04093.
No actual dyno or bench-flow chart is linked for this exact selection. Manufacturer descriptions of flow, throttle response, insulation and spool behavior do not independently establish numeric horsepower, torque, spool-time, EGT or underhood-temperature changes. Current manufacturer cites CARB EO D-550-48 and says SOME OR ALL listed applications are exempt. The indexed official Exhibit A names this exact part for 2001-2004 LB7 Silverado/Sierra 2500/3500. The full order and exact exclusions remain held after an earlier access challenge, so the headline does not certify every vehicle or modified configuration. Exact full installation instructions and the complete separately numbered bill remain unavailable. Manufacturer factory-location/bolt-on wording does not independently establish every access step, clamp quantity, reused part or absence of cutting. No related-engine instructions are borrowed.
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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