The aFe 49-44085-P Large Bore-HD single-exit five-inch system uses mandrel-bent 409 stainless tubing behind the retained DPF, with one six-inch polished clamp-on tip and factory-style hanger locations.
For the specified 6.6L Duramax L5P diesel pickups only: crew cab short bed, 153.7-inch wheelbase with 6.6-foot bed, or crew cab long bed, 167.7-inch wheelbase with eight-foot bed. The exact selected retailer table supplies the named trims below; the manufacturer application table supplies model/engine coverage, not independent approval of every named trim. The current manufacturer application table lists Chevrolet HD models for 2018–2019 and GMC HD models for 2017–2019, while its headline, selected guide and exact retailer include 2017 Chevrolet. Existing 2017 Chevrolet scopes remain explicitly unverified; no incompatibility is inferred from omission. The new Silverado 3500 HD LT scope is limited to 2018–2019 pending clarification. No separate dual-exit system restriction or unsupported cab configuration is inferred.
| Years | Make | Model | Submodel | Verification / restriction |
|---|---|---|---|---|
| 2017-2019 | Chevrolet | Silverado 2500 HD | High Country | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LT | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LTZ | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | WT | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | High Country | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2018-2019 | Chevrolet | Silverado 3500 HD | LT | New LT scope limited to 2018–2019; 2017 retailer/guide support conflicts with current manufacturer application table and is not newly mapped. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LTZ | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | WT | 2017 legacy portion HELD / UNVERIFIED: selected guide and retailer include it, but the current manufacturer application table begins Chevrolet at 2018. Existing 2017 scope retained pending confirmation. |
| 2017-2019 | GMC | Sierra 2500 HD | Base | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 2500 HD | Denali | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 2500 HD | SLE | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 2500 HD | SLT | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 3500 HD | Base | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 3500 HD | Denali | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 3500 HD | SLE | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | GMC | Sierra 3500 HD | SLT | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| Detail | Value |
|---|---|
| Manufacturer Part Number | 49-44085-P |
| Product type | DPF Back |
| Tube / construction | Five-inch mandrel-bent 409 stainless tubing; manufacturer specifies hand MIG welding |
| Selected stainless sections | Over-axle pipe 05-144302 and tailpipe 05-44769 |
| Selected tip arrangement | One six-inch polished stainless tip 49T50601-P161 |
| Bands / plugs | One four-inch band 05-41172 and one five-inch band 05-41173; one M14 plug 05-46020 and one M16 plug 05-46019 |
| Stock exhaust cuts | Measure rearward from the REAR weld line of the retained DPF: three inches for crew short bed, 26 inches for crew long bed. These are stock-exhaust cut locations, not new-tube trimming dimensions. |
| Sensor instruction gap | NOx removal is specified for both cab lengths. Long bed retains EGT and EPD sensors in place; short bed reinstalls all OE sensors into the new exhaust. Long-bed instructions install two supplied plugs but do not explicitly state where the removed NOx sensor is refitted. Obtain the correct refitting and wiring requirements before removal; omitted or disconnected sensors are not an operating configuration. |
| Torque / recheck | The selected guide gives no numerical torque. Check sensors and bands for exhaust leaks after completion; re-tighten all exhaust components after 50–100 miles. |
| Emissions / performance | The exact current manufacturer page says no CARB EO number is required. Retailer California restriction metadata conflicts and does not establish a numbered order or blanket approval. No exact selected numerical dyno, EGT, fuel-economy or sound result is verified. |
| Spare heat-shield clearance | Selected step 6 requires at least one inch between exhaust pipe and spare-tire heat shield. |
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
It is the five-inch 409 stainless single-exit DPF-back with one six-inch polished tip. It retains the truck’s DPF and is limited to the documented diesel crew-cab applications.
Which cab and bed combinations are documented?Crew short bed with 153.7-inch wheelbase and 6.6-foot bed, or crew long bed with 167.7-inch wheelbase and eight-foot bed. Match the actual diesel truck and installed equipment; no other cab or engine is inferred.
Where is the original exhaust cut?Support its weight before cutting under the truck. Mark three inches rearward from the DPF rear weld line for crew short bed, or 26 inches rearward from that same weld line for crew long bed, then remove the rear tail section. The selected guide requires cutting stock exhaust.
Does this remove the DPF?No. It is a DPF-back system installed behind the retained diesel particulate filter. It does not authorize emissions-system deletion or sensor omission.
What sensor detail needs confirmation before installation?Both configurations begin with NOx removal. The long-bed procedure leaves EGT and EPD sensors in place and installs two plugs in the new over-axle pipe, but does not explicitly describe returning the removed NOx sensor. Obtain the correct refitting requirements before removal. Short bed explicitly reinstalls all OE sensors.
How are spare-tire and tailpipe clearances handled?Maintain at least one inch between the exhaust pipe and spare-tire heat shield, as specified in the selected guide. Do not borrow another exhaust’s spare-repositioning procedure.
What application qualification remains?Current manufacturer application rows start Chevrolet at 2018, despite 2017 support in its headline, selected guide and retailer table. Existing 2017 Chevrolet scopes remain held and unverified; new Silverado 3500 HD LT mapping begins at 2018. GMC rows begin at 2017.
What tightening and follow-up interval are printed?Keep bands loose until the system is fully assembled and aligned. Tighten only the tip’s band when positioning the tip, then align everything and tighten the remaining bands. Check sensors and bands for leaks. Re-tighten all exhaust components after 50–100 miles; no numerical torque is printed.
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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