1. Exhaust Snowmobile Parts For Sale
  2. sku: 9607401562660602
  3. SPORTS INC 4403-S678647-83

SPORTS PARTS INC 4403-S678647-83 Spi Tailpipe Ski Doo GASKET-51 1/2 I.D.X64 O.D.X16 1/5

fits model: X16, Mx, 800. make: Ski-doo. year: 2004–2009.

4403-s678647-83 Sports Parts Inc Spi Tailpipe Gasket-51 1/2 I.d.x64 O.d.x16 1/5 H For 2004-2009 Ski-doo Mx Z 800

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 4403-S678647-83 )

Review SPORTS PARTS INC Spi Tailpipe 1/2.d.x64.d.x16 1/5for Ski doo fits X16 MX 800 2004–2009

The **SPI Tailpipe Gasket (Part #4403-S678647-83)** is a precision-engineered aftermarket component designed exclusively for the **2004 2009 Ski-Doo MX 800**, ensuring a secure and leak-proof seal between the exhaust system and the tailpipe assembly. Crafted from high-performance **heat-resistant silicone rubber**, this gasket is engineered to withstand the extreme temperatures and pressures generated by the MX 800 s powerful twin-cylinder engine, preventing exhaust gas leaks that could compromise performance and efficiency. With precise dimensions of **51 inches in inner diameter (I.D.)**, **64 inches in outer diameter (O.D.)**, and a **16/5th-inch thickness**, this gasket is tailored to fit snugly within the MX 800 s exhaust manifold junction, eliminating gaps that could lead to backpressure or exhaust fumes entering the cabin. Its durable construction also resists oil and fuel contamination, maintaining a reliable seal even under prolonged use or off-road conditions where debris and moisture are common. Ideal for both stock and modified setups, this gasket is a straightforward yet critical upgrade for riders seeking to enhance exhaust system integrity, reduce noise intrusion, and ensure optimal engine performance. Whether replacing a worn-out OEM gasket or upgrading to a more robust aftermarket solution, the SPI Tailpipe Gasket delivers a seamless fit and long-lasting durability, making it a trusted choice for Ski-Doo enthusiasts who demand precision and reliability in their off-road equipment.

### **Pros and Cons of buying a SKi-DOO MX 800 Tailpipe Gasket (Part #4403-S678647-83 SPI)**

#### **Pros:**

1. **Direct Fitment** This gasket is specifically designed for the 2004 2009 Ski-Doo MX 800, ensuring compatibility without modifications. It matches the exact dimensions (5 " ID, 6 " OD, 16/5 thickness) required for the tailpipe assembly.

2. **Prevents Exhaust Leaks** A worn or missing tailpipe gasket can cause exhaust gas leaks, reducing performance and increasing emissions. Replacing it seals the joint properly, maintaining engine efficiency and reducing noise.

3. **Easy Installation** The gasket is a simple rubber or silicone component that fits between the tailpipe and exhaust housing. Most mechanics or DIYers can replace it in under an hour with basic tools (socket wrench, gasket scraper, and thread locker if needed).

4. **Cost-Effective** Compared to labor costs for professional installation, purchasing the gasket yourself is inexpensive. It s a straightforward part that doesn t require specialized tools or expertise beyond basic mechanical knowledge.

5. **Extends Tailpipe Lifespan** A properly sealed gasket prevents heat and exhaust gases from degrading the surrounding metal, potentially prolonging the life of the tailpipe and muffler assembly.

6. **OEM Quality (or Near-OEM)** If sourced from a reputable brand (e.g., SKi-DOO, SPI, or a trusted aftermarket supplier), the gasket should meet or exceed factory standards in durability and sealing performance.

7. **Minimal Downtime** Since the part is small and the installation is quick, replacing the gasket doesn t require a long outing or significant downtime for the vehicle.

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#### **Cons:**

1. **Potential for Counterfeit Parts** If purchased from an untrusted seller (e.g., unverified online marketplaces or discount retailers), there s a risk of receiving a low-quality or fake gasket. This could lead to premature failure or leaks.

2. **Thread Damage Risk** If the exhaust housing or tailpipe threads are corroded or stripped, the gasket alone won t fix the issue. In such cases, additional parts (e.g., a new tailpipe or gasket sealant) may be needed.

3. **Heat and Vibration Stress** The tailpipe gasket is exposed to high temperatures and engine vibrations, which can cause it to degrade over time. Even a high-quality gasket may need replacement every few years, depending on usage.

4. **Limited Availability** While this gasket is widely compatible with the MX 800, older models or rare variants might have difficulty finding exact replacements. Always verify the part number before purchasing.

5. **DIY Installation Challenges** If the exhaust system is heavily corroded or the gasket area is dirty, improper cleaning or installation could lead to leaks. Using a gasket scraper and thread locker (e.g., Loctite 577) can help, but mistakes are possible for inexperienced users.

6. **Price Variability** Prices can fluctuate based on the seller and region. While generally affordable, some aftermarket alternatives may be slightly more expensive than OEM parts.

7. **No Warranty on Aftermarket Parts** If buying from a non-OEM supplier, there may be no warranty or return policy, unlike purchasing directly from Ski-Doo or an authorized dealer.

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### **Conclusion:**

The **SPI tailpipe gasket (4403-S678647-83)** is a practical and cost-effective solution for addressing exhaust leaks in the 2004 2009 Ski-Doo MX 800. Its direct fitment, ease of installation, and role in maintaining engine performance make it a worthwhile upgrade for most owners. However, the risk of counterfeit parts, potential thread issues, and the gasket s exposure to harsh conditions are factors to consider.

For best results:

- **Purchase from a trusted source** (e.g., Ski-Doo dealerships, reputable online retailers like Amazon, or specialty ATV parts stores).

- **Inspect the exhaust threads** before installation to ensure they re clean and undamaged.

- **Use thread locker** (e.g., Loctite 577) to prevent loosening over time.

- **Follow installation guidelines** carefully, including proper cleaning of the gasket surface.

If you re comfortable with basic mechanical work, this gasket is an easy and affordable fix. If the exhaust system shows signs of broader corrosion or damage, consider addressing those issues simultaneously for long-term reliability.

### **Recommendation:**

**Buy the gasket from a verified supplier** (e.g., Ski-Doo s official parts catalog, SPI s website, or a well-reviewed online retailer) and install it yourself if you re confident in your abilities. If you re unsure about the condition of the exhaust threads or surrounding components, consult a mechanic to avoid recurring issues. For most MX 800 owners, this part is a straightforward and necessary maintenance item to keep the exhaust system functioning properly.

Details:

Parts without fitment are to be assumed universal and may require vehicle modification. This is helpful if you are buying multiple items. I need to exchange an item. 2009 - 2011 Ski-Doo MX Z 600 TNT.

2004 - 2005 Ski-Doo MX Z 500 Trail. 2007 - Ski-Doo MX Z 600 Blizzard.: Brand: Sports Parts Inc, model Number: 4403-S678647-83.

part #: 4403s67864783 price

  • $34.46

specifications exhaustsnowmobilee:

  • for models: X16, Mx, 800
  • for makes: Ski-doo
  • for years: 2004-2009
  • brand: Sports Parts Inc
  • mpn: 4403-s678647-83

payments exhaustsnowmobilee:

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seller exhaustsnowmobilee:

  • rating: 99.9%
  • # reviews: 77602
  • city: Boise, ID

offer exhaustsnowmobilee:

  • availability: In Stock
  • options: Ship-to-home
  • quantity: 9
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  • started: February 13, 2026

general exhaustsnowmobilee:

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

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  • time: 30 Days

shipping exhaustsnowmobilee:

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  • type: Fixed
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for models: x16, mx, 800, for makes: ski-doo, for years: 2004-2009,
category: snowmobile parts > exhaust, sku: 9607401562660602,
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