The aFe 49-44086-P Large Bore-HD dual-exit four-inch system uses mandrel-bent 409 stainless tubing behind the retained DPF, with two five-inch polished 304 stainless tips and a driver-side bolt-on hanger bracket.
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 selected manufacturer page and guide exclude cab-and-chassis and fifth-wheel-package models.
| Years | Make | Model | Submodel | Verification / restriction |
|---|---|---|---|---|
| 2017-2019 | Chevrolet | Silverado 2500 HD | High Country | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LT | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LTZ | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 2500 HD | WT | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | High Country | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LT | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LTZ | Exact selected retailer named scope; manufacturer 6.6L L5P diesel model/engine and stated crew-cab/bed restrictions apply. |
| 2017-2019 | Chevrolet | Silverado 3500 HD | WT | 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 | 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 | 49-44086-P |
| Product type | DPF Back |
| Tube / construction | Four-inch mandrel-bent 409 stainless tubing; manufacturer specifies hand MIG welding |
| Selected stainless sections | Y-pipe 05-144313, right tailpipe 05-144314 and left tailpipe 05-144315 |
| Selected tip arrangement | Two five-inch polished 304 stainless tips. The selected guide labels 49T40501-P121 right and 49T40502-P121 left; confirm replacement handedness against the actual kit. |
| Bands / plugs | Three four-inch bands 05-41172; 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. |
| Hanger / mount | One bracket #54 05-41953 and one rubber isolation mount 05-46050; bracket reuses stock bolts. |
| Spare-tire statement conflict | Manufacturer overview says no spare relocation, but selected step 8 requires loosening the spare, moving it toward the passenger-side heat shield and securing it again. Follow the selected clearance procedure; no numerical clearance is printed. |
| Tip-reference qualification | Another application guide reverses the same tip references. Do not order replacement handedness from another vehicle’s diagram; verify the actual selected kit and outlet/badge orientation. |
| Driver-side protection | Step 10 provides zip ties and adhesive heat shielding for use only if necessary around axle brake-line cables/hoses. Formal quantities and part numbers are not printed. |
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 four-inch 409 stainless dual-exit DPF-back with two five-inch polished tips. 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 Y-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?Loosen the spare, move it toward the passenger-side heat shield to clear the left tailpipe, then tighten it back up. This printed procedure conflicts with the overview’s no-relocation statement. No exact clearance dimension is supplied.
What application qualification remains?The exact manufacturer page and guide exclude cab-and-chassis and fifth-wheel-package models. Named trims come from the exact selected retailer table and still require the stated cab, bed and diesel configuration.
What tightening and follow-up interval are printed?Keep bands loose until the system is fully assembled and aligned. Tighten all bands and both tips after alignment. 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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