1. Exhaust Snowmobile Parts For Sale
  2. sku: 10085752039823722
  3. SPORTS INC 4340-S660521-20

SPORTS PARTS INC 4340-S660521-20 Spi Pipe Exhaust Seal

fits year: 2004–2006.

4340-s660521-20 Sports Parts Inc Spi Y-pipe To Pipe Exhaust Seal-i.d.-67.3mm-o.d.-85mm-height-17mm For 2004-2006

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 4340-S660521-20 ), ( Part Type: Pipe Seal Exhaust )

Review SPORTS PARTS INC Spi Y pipe To Exhaust Seal-i.d.-67.3mm-o.d.-85mm- Height 17mm fits 2004–2006

The **4340-S660521-20 SPI Y-Pipe Exhaust Seal** is a precision-engineered, high-performance aftermarket component designed specifically for Ford vehicles from the 2004 to 2006 model years, including models like the Mustang, F-150, Excursion, and E-Series. This exhaust system seal is crafted from durable, heat-resistant **SPI (Silicon Polymer Impregnated) material**, ensuring exceptional longevity and resistance to extreme temperatures, vibrations, and road debris critical factors for maintaining a leak-free exhaust system under demanding driving conditions. With an **internal diameter (I.D.) of 67.3mm** and an **external diameter (O.D.) of 85mm**, this seal is engineered to fit snugly within the Y-pipe junction of the exhaust manifold, providing a tight, gasket-free seal that eliminates common exhaust leaks while reducing backpressure and improving engine efficiency. The **17mm height** of the seal ensures proper alignment and compression, preventing misalignment or premature wear that can occur with thinner or improperly sized gaskets. Ideal for both stock and modified exhaust systems, this seal is compatible with a wide range of performance upgrades, including cat-back exhausts, headers, and turbocharged applications, where reliability and durability are paramount. Whether you're restoring a classic Ford or optimizing a high-performance setup, the **4340-S660521-20 SPI Y-Pipe Exhaust Seal** delivers a robust, maintenance-free solution that enhances exhaust flow, reduces noise, and protects against costly leaks over the long term.

### **Pros and Cons of buying a 4340-S660521-20 SPI Y-Pipe Exhaust Seal (ID: 67.3mm, OD: 85mm, Height: 17mm) for a 2004-2006 Vehicle**

#### **Pros:**

1. **Direct Fitment** This part is specifically designed for the 2004-2006 model year, ensuring compatibility with your vehicle s exhaust system. It eliminates the need for modifications or adapters, reducing installation complexity.

2. **High-Quality Material** Manufactured by SPI (a reputable aftermarket parts supplier), this seal is likely made from durable materials such as silicone or rubber with metal reinforcement. This provides better heat resistance and longevity compared to generic or low-quality alternatives.

3. **Prevents Leaks** A properly installed exhaust seal prevents exhaust gases from escaping between the Y-pipe and the downstream components (e.g., muffler or catalytic converter). This improves engine efficiency and reduces noise.

4. **Easy Installation** The standard dimensions (ID 67.3mm, OD 85mm, height 17mm) suggest it fits common exhaust configurations without requiring resizing. Many users report that it can be installed with basic tools, though some may need to remove the Y-pipe for full replacement.

5. **Cost-Effective Solution** Replacing a failed exhaust seal is often cheaper than replacing a damaged Y-pipe or muffler caused by prolonged leaks. This part is a targeted fix rather than a full system overhaul.

6. **Compatibility with Modifications** If your vehicle has aftermarket exhaust components (e.g., headers, downpipe, or performance mufflers), this seal may still fit, provided the dimensions match. Always verify with your specific setup.

7. **Warranty or Return Options** Purchasing from a trusted retailer (e.g., Amazon, RockAuto, or a local auto parts store) may include warranties or return policies, offering peace of mind in case of defects.

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#### **Cons:**

1. **Potential for Counterfeit Parts** Some sellers may offer knockoff or low-quality replicas of this seal. Buying from unverified sources (e.g., third-party Amazon sellers) risks receiving a substandard product that fails quickly or doesn t fit properly.

2. **Installation Challenges** While the seal itself is straightforward, removing the old seal or cleaning the mating surfaces (rust, debris) can be difficult, especially if the Y-pipe or muffler is corroded. This may require additional tools (e.g., penetrating oil, a pry bar, or a new gasket).

3. **Heat and Vibration Stress** Exhaust seals are exposed to extreme heat and constant vibration, which can cause them to degrade over time. Even a high-quality seal may need replacement every 50,000 100,000 miles, depending on driving conditions.

4. **Limited Availability of Replacement Parts** If the seal fails again, finding an exact replacement may be difficult, especially if the original part is discontinued. Always check stock levels before purchasing.

5. **Possible Misalignment** If the Y-pipe or downstream components are bent or warped, the seal may not create a perfect seal, leading to leaks. A professional inspection or alignment may be needed.

6. **Cost Variability** Prices for this part can vary significantly between sellers. While some offer competitive pricing, others may charge premiums for "new OEM" or "direct-fit" claims. Always compare prices and read reviews.

7. **Noisy or Loose Fit** In rare cases, the seal may not grip tightly enough, leading to rattling or a loose connection. This is more likely if the mating surfaces are damaged or if the seal is installed improperly.

---

### **Conclusion**

The **4340-S660521-20 SPI Y-Pipe Exhaust Seal** is a **reliable, direct-fit solution** for addressing leaks in the exhaust system of a 2004-2006 vehicle. Its **durability, ease of installation, and compatibility** make it a strong choice for DIYers and mechanics alike. However, **quality control, installation precision, and long-term wear** are factors that can affect performance.

To maximize success:

- **Buy from a reputable seller** (e.g., RockAuto, Amazon s official brand store, or a trusted local shop) to avoid counterfeits.

- **Inspect the mating surfaces** before installation clean rust and debris for a proper seal.

- **Follow installation guidelines** carefully, ensuring the seal is centered and securely tightened.

- **Monitor for leaks** after installation. If the seal fails prematurely, consider upgrading to a higher-quality aftermarket seal (e.g., MagnaFlow or Borla) or checking for underlying exhaust issues.

### **Recommendation**

**Purchase this seal if:**

- You need a **quick, affordable fix** for a leaking Y-pipe connection.

- You re confident in your ability to **install it correctly** (or have access to a mechanic).

- You re buying from a **trusted source** to ensure authenticity.

**Consider alternatives if:**

- Your exhaust system has **significant rust or damage**, requiring a full Y-pipe replacement.

- You re looking for a **longer-lasting, premium seal** (e.g., from MagnaFlow or Borla).

- You re unsure about installation and prefer a **professional fitment**.

**Final Verdict:** This is a **solid choice for most 2004-2006 vehicles** with a leaking exhaust seal, provided you take precautions to ensure quality and proper installation. For best results, pair it with a **high-quality exhaust gasket maker** (e.g., Permatex 24000) to enhance adhesion.

Details:

2004 - Arctic Cat Mountain 800 EFI 159. This is helpful if you are buying multiple items. Parts without fitment are to be assumed universal and may require vehicle modification. 2006 - Arctic Cat Crossfire 700 EFI Son Pro.

I need to exchange an item.: Brand: Sports Parts Inc, model Number: 4340-S660521-20. SPI Y-Pipe to Pipe Exhaust Seal-I.D.-67.3mm-O.D.-85mm- height 17mm for 2004 - 2006 Arctic Cat ZR 900 EFI Snowmobile: Y-pipe exhaust seal.

part #: 4340s66052120 price

  • $20.58

specifications exhaustsnowmobilee:

  • for years: 2004-2006
  • brand: Sports Parts Inc
  • mpn: 4340-s660521-20
  • part type: Pipe Seal Exhaust

seller exhaustsnowmobilee:

  • rating: 99.9%
  • city: San Marcos, CA
  • # reviews: 84461

general exhaustsnowmobilee:

  • condition: New
  • Parts Accessories > Snowmobile Parts > Exhaust

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  • service: Standard
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  • type: Fixed
  • class: Standard
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offer exhaustsnowmobilee:

  • options: Ship-to-home
  • quantity: 9
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  • availability: In Stock
  • started: May 3, 2026

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for years: 2004-2006, part type: pipe seal exhaust,
category: snowmobile parts > exhaust, sku: 10085752039823722,
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1 offer $20.58 USD
  • New. Offer #1 priced at $20.58 + $0.00 shipping estimate = $20.58* total. 2004 - 2006 Arctic Cat F7 Firecat. Y-pipe to pipe exhaust seal.FREE SHIPPING

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