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SMW251346
HongPro
SMW251346
Engineered for superior durability and optimal exhaust flow, the SMW251346 Exhaust Manifold is a direct-fit, high-performance replacement solution. Constructed from high-grade cast iron, it ensures exceptional thermal stability and resistance to extreme thermal cycling, effectively minimizing the risk of warping or cracking.
Its precision-engineered tubular design is optimized to reduce exhaust backpressure by an estimated 15-20% compared to worn stock units. This facilitates smoother exhaust gas scavenging, which can contribute to more efficient engine operation and potential improvements in throttle response.
This component undergoes rigorous quality control, including pressure and dimensional checks, guaranteeing a perfect OE fit and reliable, long-term performance. It is the definitive choice for a robust and dependable exhaust system upgrade.
Crafted from high-quality cast iron, this exhaust manifold is built to last. This specific material formulation offers exceptional resistance to thermal fatigue and corrosion, directly combating the primary causes of failure in OEM parts. It maintains structural integrity under continuous exposure to temperatures exceeding 800°C (1472°F), effectively preventing warping and cracking. This ensures a reliable, long-term solution that outperforms standard manifolds, providing peace of mind and reducing the likelihood of premature replacement.
The internal geometry of the SMW251346 is precision-cast and machined to minimize exhaust backpressure. Computational Fluid Dynamics (CFD) analysis informs the design of the runners, ensuring smoother gas flow from the engine ports. This efficient scavenging effect can lead to a more responsive throttle and contributes to overall engine efficiency. By allowing the engine to "breathe" out more freely, it reduces engine load and promotes stable performance.
We understand that fitment is paramount. Every SMW251346 manifold undergoes a stringent quality control process, including coordinate-measuring machine (CMM) inspections to verify critical dimensions against OE specifications. This guarantees a perfect, hassle-free installation without modifications, saving valuable time and labor costs. Our commitment to dimensional accuracy ensures a perfect seal with the cylinder head and turbocharger/downpipe, eliminating exhaust leaks from day one.
This component is designed as an OEM+ (Original Equipment Manufacturer Plus) part. It meets or exceeds the original performance benchmarks while incorporating improvements in material and casting quality learned from field data. While not a "performance" part in the racing sense, its efficient design can contribute to a restoration of lost horsepower and torque from a worn or cracked original unit, bringing your engine back to its intended operating parameters reliably.
Manufactured using state-of-the-art sand-casting techniques and robotic finishing, the SMW251346 ensures consistency and reliability in every unit. This automated process eliminates human error in critical stages, resulting in a manifold free from internal flaws or sand inclusions that can plague inferior aftermarket parts. The result is a product you can trust for its consistent high quality and dependable performance batch after batch.
| Specification Category | Detailed Parameter |
| Core Part Number | SMW251346 |
| Product Type | Exhaust Manifold |
| Primary Material | High-Grade Gray Cast Iron (GG-25 Equivalent) |
| Surface Treatment | High-Temperature Anti-Corrosion Coating |
| Flange Thickness | 16.5 mm ± 0.2 mm |
| Port Runner Design | Log-style, Optimized-Flow Casting |
| Stud Thread Sizes | M8 x 1.25 (Cylinder Head), M10 x 1.5 (Turbo/Downpipe) |
| Heat Resistance | Up to 900°C (1652°F) Continuous |
| Quality Certification | ISO 9001:2015 & IATF 16949:2016 Certified Manufacturing |
| Weight | 8.5 kg (Approx.) |
| Dimensional Inspection | 100% CMM (Coordinate Measuring Machine) Verified |
Here are specific application scenarios of Exhaust Manifold:
The most common application for the SMW251346 is as a direct, high-quality replacement for an original manifold that has failed. OEM manifolds are prone to cracking and warping due to constant extreme thermal cycling. This part directly addresses this weakness with its superior high-grade cast iron construction and proven heat resistance up to 900°C, offering a more durable and reliable solution that restores engine performance and eliminates exhaust leaks.
Use this manifold to comprehensively restore lost engine power and fuel efficiency. A cracked or warped OEM manifold disrupts exhaust scavenging, leading to increased backpressure, sluggish acceleration, and higher emissions. By installing this precision-engineered component, you effectively reduce backpressure, facilitating smoother exhaust flow. This restores optimal engine breathing, leading to sharper throttle response and regained horsepower.
For owners seeking enhanced long-term reliability, this manifold serves as an excellent preventive upgrade. Replacing a aging but still functional OEM unit with this more robust aftermarket part before it fails can prevent unexpected breakdowns and costly secondary damage to nearby components like the turbocharger or oxygen sensors. It's a proactive investment in vehicle uptime and operational consistency.
This component is the ideal choice during major engine service intervals or comprehensive overhaul projects. Whether the engine is being rebuilt due to high mileage or other repairs, installing a new, high-performance exhaust manifold ensures the entire system starts with a like-new, or even better-than-new, foundation. It guarantees a perfect fit and seals the system correctly for the long haul, integrating seamlessly with other new engine components.
For a successful installation, we recommend allowing the vehicle's exhaust system to cool completely to ambient temperature before beginning. Always use a new exhaust manifold gasket and new mounting hardware to ensure a perfect, leak-free seal. Torque the fasteners in the correct sequence and to the manufacturer's specified values, typically in three progressive stages, to prevent warping. Finally, perform a visual inspection and start the engine to check for any exhaust leaks.
