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Catted downpipe pair for Toyota Tacoma V6 3.5L, 2016–2023
The aFe 48-46012-HC pair contains one passenger and one driver downpipe, each with a catalytic converter, using 2-1/2–2-1/4-inch mandrel-bent 409 stainless tubing, MIG welds and laser-cut mild-steel flanges. The current exact manufacturer page and selected guide cover listed 2016–2023 Tacoma V6 3.5L applications. The guide removes heatshields and loosens the driver support bracket without an explicit final disposition/restoration step; confirm those details and every original O2 electrical connection before work.
Key Features
- Selected aFe part 48-46012-HC.
- One passenger catted downpipe 05-144804 and one driver catted downpipe 05-144805.
- 2-1/2–2-1/4-inch mandrel-bent 409 stainless tubing, 100% MIG welds and factory-style laser-cut mild-steel flanges.
- Two crush gaskets 05-60366, six M10 x 1.25 x 35 mm bolts 03-50401 and six M10 x 1.25 nuts 03-50400.
- Original manifold gaskets may be reused only when undamaged; replace if necessary under exact vehicle service requirements.
- Original O2 sensors are physically transferred. Confirm restoration of every original sensor connector because the final selected electrical step specifically names the remaining rear sensors.
- Selected guide removes both heatshields and loosens the driver support bracket without explicit final completion steps for those items; obtain correct manufacturer/vehicle instructions before work.
- No cutting or modifications to the factory exhaust are stated. Recheck all clamps and hardware after 50–100 miles; the generic band-clamp value is not a flange or support-bracket torque.
- Manufacturer claims EPA compliance and excludes California-certified vehicles. Exact eligibility and legitimate documented replacement need must be verified.
Fitment
The exact current manufacturer application and August 2026 selected guide state 2016–2023 Toyota Tacoma gasoline V6 3.5L. Full exact-MPN named proof verifies Limited, SR, SR5, TRD Off-Road and TRD Sport 2016–2021; TRD Pro 2017–2021; and Trail 2021. Original named bounds remain unchanged; later 2022–2023 named extensions are held until exact proof is available. Do not borrow the separate 4WD-only Y-pipe’s drivetrain restriction or extend to another engine/generation.
| Years | Make | Model | Submodel | Required engine / configuration / emissions |
|---|---|---|---|---|
| 2016-2021 | Toyota | Tacoma | Limited | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2016-2021 | Toyota | Tacoma | SR | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2016-2021 | Toyota | Tacoma | SR5 | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2021 | Toyota | Tacoma | Trail | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2016-2021 | Toyota | Tacoma | TRD Off-Road | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2017-2021 | Toyota | Tacoma | TRD Pro | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
| 2016-2021 | Toyota | Tacoma | TRD Sport | Gasoline V6 3.5L only; match exact OE connections, vehicle configuration and emissions certification. Later named years are not inferred from the broader headline. |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 48-46012-HC |
| Product type | Downpipes |
| Construction | 2-1/2–2-1/4-inch 409 stainless mandrel-bent tubing, MIG welds and laser-cut mild-steel flanges. Tube gauge, flange thickness and catalyst cell count are not separately printed. |
| Selected bill | One passenger catted downpipe 05-144804; one driver catted downpipe 05-144805; two crush gaskets 05-60366; six bolts 03-50401 and six nuts 03-50400. No separate band clamp or new sensor is listed. |
| Complete selected guide | Two pages, all 25 steps, formal bill, diagram and both fender-liner photographs; document 06-86599, August 2026. Current guide years extend to 2023, beyond the old 2016–2017 storefront title. |
| Original components / support | Original manifold gaskets may be reused if undamaged, otherwise replaced. Original nuts are retained. Passenger bracket is restored with supplied nut/bolt; driver block-bracket bolts are loosened, not removed, but an explicit driver-bracket restoration step is absent. Confirm correct final arrangement with aFe and exact vehicle service instructions before disassembly. |
| Heatshield / sensor completion hold | Both heatshields are removed without a final disposition step. Both original front O2 sensors are physically transferred, while the final electrical step explicitly names remaining rear sensors. Confirm correct heatshield disposition and complete every original O2 harness connection before operation; no removal/disable/delete permission is implied. Fender liners and negative battery connection are restored. |
| Torque / interval | The sheet’s 40–45 ft-lb statement is labeled for band clamps, but no band clamp is in this selected formal bill. Do not apply it to manifold/flange, bracket, spring-bolt or sensor fasteners; obtain exact connection specifications. Retighten all clamps and hardware after 50–100 miles. |
| Linked 2018 Tacoma dyno: marker | Selected linked chart shows 110.3 versus 98.1 hp and 201.6 versus 179.3 lb-ft at the 2,872-rpm marker: differences 12.2 hp and 22.3 lb-ft. These are same-rpm marker differences, not peak-to-peak gains. |
| Linked dyno: peaks / test limits | Peak power is 249.5 versus 247.2 hp (difference 2.3 hp), at 6,000 versus 6,100 rpm; peak torque 235.9 versus 233.1 lb-ft (difference 2.8 lb-ft), at 5,300 versus 5,400 rpm. Downpipe run September 10, 2019 at 1:07:25 PM; baseline September 12 at 1:58:16 PM; SAE 1.05 for both. Both notes identify OE intake, OE Y-pipe, OE exhaust, 1.8k start and 20% preload. OE 265/65R17 wheels/tires are printed in downpipe notes only, not repeated in baseline notes. Results are from that test, not every Tacoma configuration. |
| Emissions qualification | Manufacturer claims EPA compliance and excludes California-certified vehicles. Verify actual emissions label, exact application, applicable local requirements, documented legitimate replacement need and warranty/recall status. Age/mileage alone does not authorize replacement; no fault-code cure or inspection pass is guaranteed. |
What's Included
- The 48-46012-HC kit includes one passenger catted downpipe 05-144804 and one driver catted downpipe 05-144805.
- Two crush gaskets 05-60366, six M10 x 1.25 x 35 mm bolts 03-50401 and six M10 x 1.25 nuts 03-50400.
- Original sensors, applicable original nuts and undamaged original manifold gaskets are retained/reused under exact requirements. No band clamp, new sensor, full Y-pipe, muffler, intake filter or coupler is established as supplied.
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
- Current exact catted downpipe pair and application
- Complete selected 25-step guide, bill and fender photos
- Selected linked 2018 Tacoma dyno chart
- Full exact-MPN named application table
- EPA converter replacement guidance
- Shop downpipes
FAQ
What is the 48-46012-HC?It is a pair of converter-equipped downpipes, one passenger and one driver, with the selected gaskets and hardware for listed Tacoma V6 3.5L applications.
Is this one pipe or a passenger/driver pair?The formal bill lists two distinct catted downpipes: passenger 05-144804 and driver 05-144805. Each selected pipe has a converter; no new Y-pipe is included.
Does the old 2016–2017 title describe current scope?The exact current manufacturer application and selected guide extend to 2023. Named trim proof below remains within independently verified 2016–2021 bounds, with Trail specifically 2021.
What flanges and gaskets are specified?Current manufacturer states laser-cut mild-steel flanges and 409 stainless tubing. Two crush gaskets are supplied; original manifold gaskets may be reused only if undamaged and replaced when necessary.
What installation details need confirmation before work?The guide removes both heatshields without a final disposition step and loosens the driver support bracket without an explicit restoration step. Confirm those final arrangements and every original O2 electrical connection with aFe/exact vehicle service requirements before disassembly.
Can 40–45 ft-lb be applied to the supplied bolts?No. That printed statement is labeled for band clamps, while no band clamp is listed in this formal bill. Obtain exact manifold/flange, bracket and sensor specifications instead. Recheck all clamps and hardware after 50–100 miles.
Does the linked chart show a 12.2-hp peak gain?No. At 2,872 rpm the marked difference is 12.2 hp and 22.3 lb-ft. Differences between separate reported peaks are 2.3 hp and 2.8 lb-ft at differing RPM. Dates and test conditions are qualified above; the result is not an every-vehicle guarantee.
Does EPA compliance guarantee a legal replacement or emissions pass?No. Manufacturer excludes California-certified vehicles. Match actual certification, applicable local rules and documented legitimate need, and check warranty/recall status. Age/mileage alone, a fault code or a performance goal does not establish eligibility or guarantee an inspection pass.
Installation Instructions
- Confirm aFe 48-46012-HC against the exact vehicle and installed equipment. Inventory the actual components and follow the selected manufacturer instructions and current vehicle service requirements.
- Verify exact vehicle, original connection arrangement, actual emissions certification and legitimate replacement need. Read both pages/all 25 selected steps and inventory both catted pipes, two gaskets and six bolt/nut pairs. Before disassembly, obtain correct heatshield and driver support-bracket completion instructions and confirm how every original O2 electrical connection is restored. Cool and safely support the vehicle.
- Disconnect negative battery, remove both fender liners and unplug original O2 harness connections. Follow the selected removal of original Y-pipe/right converter and both heatshields. Loosen the specified bracket-to-block bolts without removing them, then remove the original side components in the selected sequence.
- Physically transfer the original O2 sensors to the correct selected side pipes. Install using original nuts and undamaged original manifold gaskets, replacing damaged gaskets as necessary. Restore passenger support as printed and complete driver support under confirmed manufacturer/exact vehicle requirements.
- Restore the original passenger-side converter/Y-pipe connection with selected supplied gaskets and hardware, restore spring bolts and tighten from the top. Complete confirmed heatshield disposition and every original O2 harness connector, including front transfers and remaining rear sensors; restore both fender liners and negative battery. Do not operate with incomplete supports, shields or electrical connections.
- Inspect completed routing and connections and follow exact service specifications for each fastener. The generic 40–45 ft-lb band-clamp statement is not applied to this kit’s flange, manifold, bracket or sensor hardware. Retighten all clamps and hardware after 50–100 miles.
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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