The aFe 46-40124 is a driver/passenger cast ductile-iron exhaust manifold pair for 2008–2010 F-250/F-350 6.4L Power Stroke applications. It matches factory equipment, up-pipes, heat shields, A/C routing and EGR cooler after their required access and reinstallation work; this is not a no-disassembly service.
| Years | Model | Exact engine / requirements |
|---|---|---|
| 2008–2010 | Ford F-250 / F-350 Super Duty | 6.4L Power Stroke and exact factory manifold/up-pipe interfaces. Other model applications are not certified here. |
46-40124: The June 2023 BOM labels its two manifold pieces “Driver Side (x2)” while the drawing and procedure separately cover passenger and driver sides. It also repeats internal 05-46057 for both a stud and a nut. Verify the actual two-side pair and correct hardware; do not certify two identical driver castings or rely on that duplicate internal identifier to order replacements. Generic Filter Included/Coupler Included fields do not establish filter or hose contents. The page's compatibility/bolt-on language does not remove the guide's A/C disconnection, coolant drain and EGR-cooler access work.
| Detail | Value |
|---|---|
| Manufacturer Part Number | 46-40124 |
| Configuration | Two-side manifold pair, supplied up-pipe studs/nuts and plugs; original head-mounting hardware retained |
| Material / runners | Cast ductile iron with CNC-machined inlet/outlet ports; not stainless tubing |
| Finish | No particular coating or polished tip is certified by the exact written sources |
| Fasteners / torque | 28 lb-ft for manifold-to-cylinder-head bolts and 20 lb-ft for manifold-to-up-pipe fasteners, following the exact guide. These values are not EGT-plug or wheel torque; do not overtighten the 1/8 NPT plugs. The June 2023 guide supplies no mileage recheck interval. |
| Retained equipment / installation | The passenger-side procedure requires A/C-system service, A/C-line disconnection and alternator/belt removal; use qualified A/C service and correct refrigerant recovery/restoration. Driver-side access drains coolant and removes/reinstalls the EGR cooler and dipstick. Heat shields, EGR and original equipment are retained after reassembly. |
| Emissions | Current exact primary page states not CARB exempt; unavailable for purchase in California or use on California-registered vehicles. Do not borrow the 6.0L manifold's D-550-32 exemption. |
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
A cast ductile-iron manifold pair for the specified F-250/F-350 6.4L Power Stroke, not a single universal manifold.
Does the BOM really establish two identical driver-side castings?No. It says Driver Side (x2), but the illustration and installation cover both sides. Verify the correct actual pair and resolve the labeling discrepancy.
Which hardware is supplied versus reused?Six 35 mm M8 studs, six oval-lock nuts and two 1/8 NPT plugs are listed. The head-mounting hardware is original, unlike the 6.0L kit's supplied head screws.
Can it be installed without opening the A/C system?The exact guide calls for A/C-system service and line disconnection on the passenger side. Qualified recovery/restoration and the correct actual procedure are required.
Is the EGR cooler deleted?No. The driver-side guide removes it for access and reinstalls it, with coolant drained and refilled.
What torque and recheck mileage are specified?28 lb-ft at the head and 20 lb-ft at up-pipe joints. No numerical plug torque or mileage recheck interval is supplied in this guide.
Are the repeated internal stud/nut identifiers reliable replacement-order proof?No. The BOM prints the same identifier for different hardware; identify actual dimensions and confirm replacements rather than guessing.
Is it covered by the earlier 6.0L CARB order?No. The current exact page states this 6.4L part is not CARB exempt and carries the California restriction.
46-40124: inspect every connection and resolve the documented kit discrepancies before operation.
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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