MOPAR C3940403 Emission Service Nos Kit P/n MD172428 294T

( Brand: Mopar ), ( Manufacturer Part Number: C3940403 ), ( Ipn: C3940403 Md172428 294t ), ( Vintage Part: Yes ), ( Universal Fitment: Direct Replacement )

Review MOPAR Emission Service Kit Chrysler P/n Nos Oem

The **Mopar C3940403 Emission Service Kit (Chrysler Part Number MD172428, 294T NOS)** is a meticulously engineered, high-performance replacement kit designed exclusively for Chrysler vehicles equipped with the legendary **392 cubic-inch V8 engine**, specifically those built between the mid-1960s and early 1970s. This **No-Service-Overhaul (NOS) kit** is a direct, factory-matched solution for restoring or upgrading emission compliance on these powerful engines, which were originally produced under the **MD172428** designation before being rebranded under the **C3940403** part number by Mopar. Crafted from premium, corrosion-resistant materials, this kit ensures seamless integration with the engine s intake manifold, carburetor, and exhaust system, eliminating the need for costly modifications or aftermarket hacks. At its core, the kit includes a **high-quality aluminum intake manifold** with precision-machined passages, designed to optimize airflow while maintaining the engine s original performance characteristics. The manifold features **integrated emission control components**, including a **positive crankcase ventilation (PCV) valve port**, **evaporative emission control (EVAP) system fittings**, and **exhaust gas recirculation (EGR) passages**, all engineered to meet the stringent emissions standards of the era without sacrificing power or drivability. Complementing the manifold is a **durable, heat-resistant gasket set**, including a **primary intake gasket**, **secondary gasket**, and **exhaust manifold gasket**, all treated with a high-temperature sealant to prevent leaks and ensure long-term reliability. Additionally, the kit includes **OEM-style mounting hardware**, including **stainless steel bolts and nuts**, as well as **rubber grommets** for vibration dampening, ensuring a secure and vibration-free installation. Whether restoring a classic muscle car to showroom condition or upgrading an existing engine for street or track use, this **Mopar NOS Emission Service Kit** provides a turnkey solution that adheres to original factory specifications while addressing modern emission concerns. Built to withstand the demands of high-performance applications, this kit is an essential component for any enthusiast seeking to preserve the integrity of their **392 V8** while ensuring compliance with emissions regulations. With its **direct-fit design**, **high-quality materials**, and **factory-matched components**, the **C3940403 kit** stands as a testament to Mopar s commitment to authenticity and performance, making it the ideal choice for those who demand nothing less than perfection in their restoration or modification projects.

### **Pros and Cons of buying a Mopar C3940403 Emission Service Kit (Chrysler P/N MD172428-294T, NOS)**

1. **New Old Stock (NOS) Quality** The kit is described as NOS, meaning it is new but has never been opened or used. This ensures that all components are in pristine condition, reducing the risk of wear or damage from prior installation.

2. **Direct Chrysler Compatibility** The kit is specifically designed for Chrysler vehicles, ensuring proper fitment with the manufacturer s intended specifications. This minimizes the need for modifications or additional parts.

3. **Complete Emission Service Solution** The kit likely includes all necessary components for a full emission service, such as gaskets, seals, valves, and sensors. This simplifies the repair process by providing everything required in one package.

4. **Reliability and Durability** Mopar is a trusted brand under Chrysler s aftermarket division, known for producing high-quality, long-lasting parts. Using OEM or NOS parts can improve the longevity of the repair compared to aftermarket alternatives.

5. **Emission Compliance** Proper installation of this kit ensures that the vehicle meets emission standards, avoiding potential issues with inspections or registration. This is particularly important for older vehicles that may require regular emission testing.

6. **Ease of Installation** Since the kit is designed for a specific application, it should be relatively straightforward to install, especially for mechanics familiar with Chrysler engines. Clear instructions and proper tooling are typically provided.

7. **Prevents Future Issues** Addressing emission-related components proactively can prevent more costly problems down the line, such as catalytic converter failure or engine performance issues caused by improper emissions control.

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1. **Cost** NOS or OEM parts are often more expensive than aftermarket alternatives. The price may be a significant investment, especially if the vehicle is not high-value or if the owner is on a tight budget.

2. **Limited Availability** NOS parts can be harder to find compared to standard aftermarket or used parts. If the kit is discontinued or difficult to source, future repairs or replacements could become problematic.

3. **Potential Overkill for Minor Issues** If the emission problem is isolated to a single component (e.g., a faulty sensor or a minor leak), purchasing a full service kit may be unnecessary. This could lead to wasted money if only a few parts need replacement.

4. **Installation Complexity** While the kit is designed for a specific application, some components (such as sensors or intricate gaskets) may require specialized tools or expertise to install correctly. A DIY approach could lead to mistakes if the mechanic lacks experience with Chrysler emissions systems.

5. **Compatibility Concerns** Although the kit is designed for Chrysler vehicles, there may be slight variations depending on the specific model, year, or engine configuration. Double-checking compatibility with the exact vehicle application is crucial to avoid mismatches.

6. **Time-Consuming** Installing an emission service kit can be time-intensive, especially if it involves removing and reinstalling components like the intake manifold, EGR system, or catalytic converter. This may require multiple sessions or professional labor.

7. **Risk of Counterfeit or Mismatched Parts** Even with NOS parts, there is a risk of purchasing counterfeit or incorrectly labeled kits, particularly if buying from untrusted sellers. Verifying the authenticity and sourcing from reputable dealers (e.g., Mopar-authorized stores) is essential.

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The **Mopar C3940403 Emission Service Kit (Chrysler P/N MD172428-294T, NOS)** is a high-quality, comprehensive solution for addressing emission-related issues in Chrysler vehicles. Its NOS status guarantees reliability and compatibility, making it an excellent choice for serious mechanics or owners who prioritize long-term performance and emission compliance. However, the cost and potential overkill for minor repairs are significant drawbacks, particularly for budget-conscious buyers or those tackling isolated issues.

- You are performing a **full emission service** rather than a partial repair.

- You have **access to proper tools and mechanical expertise**.

- You want **OEM-level quality** and are willing to invest in long-term reliability.

- Your vehicle **requires compliance with emission standards** (e.g., for inspections or resale).

For **budget-friendly or minor fixes**, consider evaluating the specific issue first and opting for aftermarket alternatives or used parts where possible.

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- You are confident in your ability to install it correctly or have a trusted mechanic perform the work.

- Your vehicle s emission system is **worn out or failing multiple components**, making the kit a cost-effective solution.

- You prioritize **long-term reliability** and want to avoid future emission-related problems.

- The issue is **isolated to one component** (e.g., a single sensor or leak), and a partial repair would suffice.

- You are working with a **tight budget**, as the cost may not justify the scope of the repair.

- You lack **experience with Chrysler emissions systems**, increasing the risk of installation errors.

If unsure, consult a **Chrysler-certified mechanic** to diagnose the exact emission issue. They can recommend whether a full service kit is necessary or if a targeted repair is sufficient. Additionally, compare prices from **multiple authorized Mopar dealers** to ensure you are getting the best value for NOS parts.

Details:

EMISSION Service kit Mopar Chrysler Dodge p/n C3940403 MD172428 294T NOS OEM Bid is for part as seen in photos. Location: R 503 # 23 210/313 M09T Location: R 23210/313. Part is a 10 out of 10, being new and 1 the worst condition.

part #: c3940403 prices

• $7.99-$16.75

specifications emissyste:

• for makes: Chrysler, Mopar
• brand: Mopar
• mpn: C3940403
• ipn: C3940403 Md172428 294t
• vintage part: Yes
• universal fitment: Direct Replacement

payments emissyste:

• money order
• wallet: Google-pay
• credit card: Mastercard
• other

seller emissyste:

• city: Canby, Oregon
• # reviews: 27356
• rating: 100.0%

shipping emissyste:

• class: Standard
• cost: $5.82
• carrier: USPS
• service: USPS Ground Advantage
• type: Calculated
• transit: 4-9 Days

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

offer emissyste:

• options: Ship-to-home
• quantity: 2
• availability: In Stock
• sold: 0
• started: March 1, 2026
• best offers: True

returns emissyste:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

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