Restore lost performance and eliminate exhaust leaks with the MFM Exhaust Manifold Set for 1999.5–2003 Ford 7.3L Powerstroke trucks. Designed as direct replacements for factory manifolds known to crack or warp from repeated heat cycles, these heavy-duty cast iron manifolds deliver superior durability and long-term reliability. Whether towing, hauling, or daily driving, the MFM manifolds help maintain strong exhaust flow and proper turbo efficiency.
Each manifold is precision-machined to ensure perfect sealing and smooth installation. MFM reinforces vulnerable OEM failure points, providing improved strength where the factory castings typically fail. With included gaskets and hardware, this kit is ready for straightforward installation and is ideal for bringing high-mileage 7.3L Powerstroke engines back to proper performance.
Features:
- Heavy-duty cast iron construction resists warping and cracking
- Redesigned structure reinforces common OEM weak failure areas
- Leak-resistant sealing surfaces ensure long-term exhaust integrity
- Precision-machined flanges deliver accurate fit and alignment
- Heat-shield included where applicable for component protection
- Direct OEM-style replacement requires no modifications to install
- Ideal solution for replacing cracked or leaking stock manifolds
- Backed by MFM 1-year warranty for dependable service life
Specifications:
- Material: Heavy-Duty Cast Iron
- Design: Direct OEM Replacement
- Flanges: Precision-Machined for Proper Sealing
- Durability: Reinforced High-Stress Areas
- Heat Shield: Included Where Applicable
- Gaskets: Multi-Layer Steel Construction
- Hardware: High-Strength Studs and Nuts
- Finish: Heat-Resistant Black Coating
- Replaces OEM P/N: F81Z9431AA / F81Z9430AA
Included:
- (2) Exhaust manifolds
- (2) Gaskets (manifold to cylinder head)
- (4) Studs (manifold to exhaust pipe flange)
- (4) Nuts (manifold to exhaust pipe flange)
Fitment:
- 1999.5-2003 Ford F-250 7.3L Powerstroke
- 1999.5-2003 Ford F-350 7.3L Powerstroke
- 1999.5-2003 Ford F-450 7.3L Powerstroke
Notes:
- 1-Year Warranty
- Direct Replacement
- Interchange P/N: F81Z9431AA, F81Z 9431 AA, F81Z9430AA, F81Z 9430 AA