COMETIC EX997064AM Exhaust Gasket Set Ski Doo 420663820

( Brand: Cometic ), ( Manufacturer Part Number: EX997064AM ), ( Part Type: Gasket Exhaust )

Review COMETIC Ski Doo Skidoo Mach z Upgraded Exhaust Gasket Set Of New fits MACH

The **Cosmetic EX997064AM Ski-Doo Mach-Z Exhaust Gasket Set (Part #420663820)** is a precision-engineered replacement component designed to restore optimal performance and sealing integrity to the exhaust system of your Ski-Doo Mach-Z outboard engine. Crafted from high-temperature-resistant materials, this gasket set ensures a reliable, leak-free interface between the exhaust manifold and the engine block, preventing the escape of pressurized exhaust gases and maintaining peak engine efficiency. The gasket set includes all necessary components typically featuring a primary exhaust gasket, a secondary gasket for the exhaust flange, and sometimes a gasket for the exhaust pipe connection all meticulously machined to fit snugly within the engine s exhaust housing. This set is engineered to withstand the extreme heat and pressure generated during high-performance operation, making it an ideal choice for riders who demand both durability and performance from their Ski-Doo. Whether you're preparing for a season of aggressive trail riding, lake cruising, or competitive racing, this gasket set provides a straightforward, cost-effective solution to prevent exhaust leaks, reduce engine strain, and uphold the factory-sealed integrity of your Ski-Doo s exhaust system. Proper installation, using the correct torque specifications and gasket sealant, ensures a long-lasting, airtight seal, allowing you to focus on the ride without worrying about exhaust-related issues.

**Pros and Cons of buying a Cosmetic Exhaust Gasket Set (Part Number: 420663820) for a Ski-Doo Mach-Z (Model: EX997064AM)**

### **Pros**

1. **Compatibility** This gasket set is specifically designed for your Ski-Doo Mach-Z (EX997064AM), ensuring a proper fit without modifications. Using the correct part reduces the risk of leaks or improper sealing.

2. **Quality Materials** Cosmetic (now part of the **MagnaFlow** brand) is a well-known manufacturer of aftermarket exhaust components for snowmobiles. Their gasket sets are typically made from durable materials like silicone or high-temperature rubber, which resist heat and wear better than generic alternatives.

3. **Easy Installation** Gasket replacement is a relatively straightforward DIY job, especially if you have basic mechanical experience. The set includes all necessary gaskets (exhaust manifold, turbocharger, and other relevant seals), reducing the need for additional parts.

4. **Prevents Leaks and Contamination** Over time, exhaust gaskets degrade, leading to **exhaust gas leaks**, **oil contamination in the turbocharger**, or **reduced engine efficiency**. Replacing them proactively can prevent costly turbocharger damage or performance issues.

5. **Cost-Effective Compared to Turbo Replacement** If your turbo is already failing due to a bad gasket, replacing just the gaskets (typically **$30 $60**) is far cheaper than a full turbocharger overhaul (which can exceed **$800 $1,200**).

6. **Improved Performance & Reliability** A properly sealed exhaust system ensures **optimal turbo function**, better **horsepower delivery**, and **reduced backpressure**, which keeps the engine running smoother.

7. **Warranty & Support** Cosmetic/MagnaFlow products often come with a **limited warranty** (usually **1 2 years**), providing peace of mind if the gaskets fail prematurely.

8. **Available Online & at Specialty Shops** This part is widely stocked on **Amazon, Ski-Doo dealers, and snowmobile specialty retailers**, making it easy to purchase without long waits.

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### **Cons**

1. **Potential for Counterfeit Parts** Since this is an aftermarket part, there is a risk of purchasing **fake or low-quality replicas**, especially if buying from untrusted sellers. Always verify the seller s reputation and check for **authentic packaging**.

2. **DIY Installation Challenges** While the job is manageable for experienced riders, **removing the exhaust system** requires **disconnecting the turbo, exhaust pipes, and possibly the intake manifold**. Mistakes here can lead to **damaged seals, bent bolts, or improper alignment**, voiding warranties.

3. **Limited Longevity Compared to OEM** Original Equipment Manufacturer (OEM) gaskets are often designed for **longer durability**, whereas aftermarket gaskets may wear out faster under extreme conditions (e.g., aggressive riding, salted trails, or high RPMs).

4. **Turbo Compatibility Concerns** If your **turbocharger is old or worn**, replacing just the gaskets may not fully resolve performance issues. In such cases, a **turbo flush or full rebuild** might be necessary alongside the gasket replacement.

5. **No Performance Boost** Unlike some aftermarket exhaust systems, gasket replacement alone **does not increase horsepower** it only restores proper function. If you re looking for a **tune-up or power increase**, you may need additional modifications (e.g., **ECU tuning, upgraded turbo, or exhaust piping**).

6. **Potential for Over-Tightening** Gaskets require **precise torque specifications** to avoid **crushing or cracking**. Over-tightening can damage the **exhaust flange or turbo housing**, while under-tightening risks leaks.

7. **Environmental & Noise Considerations** If your current exhaust is **loud or legal in your area**, replacing just the gaskets won t change the **sound signature**. Some regions have **noise regulations**, so ensure compliance if you plan further exhaust modifications.

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### **Conclusion**

Replacing the **Cosmetic Exhaust Gasket Set (420663820)** for your Ski-Doo Mach-Z is a **smart, cost-effective maintenance step** that prevents **turbo damage, exhaust leaks, and long-term engine issues**. The benefits **improved reliability, better performance, and avoidance of costly repairs** far outweigh the risks, provided you **source the part from a reputable seller** and **install it correctly**.

However, if you re **not comfortable with mechanical work**, it may be worth paying a **professional technician** ( $100 $200) to handle the job. Additionally, if your **turbo is already failing**, consider **budgeting for a full turbo service** alongside the gasket replacement.

### **Final Recommendation**

You re experiencing **exhaust leaks, oil contamination, or reduced power**.

You want to **prevent turbo damage** before it escalates.

You re **comfortable with a moderate DIY exhaust gasket replacement**.

You purchase from a **trusted seller** (e.g., official Ski-Doo dealers, reputable online retailers).

You re unsure about **installation** and don t want to risk damaging components.

Your **turbo is already failing**, and you need a **full rebuild** instead.

You re looking for **performance gains** this part alone won t increase horsepower.

- **Purchase from an authorized dealer** (e.g., **Ski-Doo Canada, Arctic Cat, or a trusted snowmobile shop**) to ensure authenticity.

- **Watch a detailed installation video** (e.g., from **Ski-Doo forums, YouTube tutorials**) before starting.

- **Consider a turbo flush** if your engine feels sluggish, as carbon buildup can also affect performance.

- **Keep spare gaskets** in case of future replacements.

**Verdict:** **Worth the investment** for maintenance and long-term engine health, but **not a performance upgrade** on its own. If done correctly, it s a **low-risk, high-reward** upgrade.

Details:

SKIDOO REFERENCE #: 420663820. FOR USE WITH SKIDOO MACH-Z 1000 2005 -2007.

part #: ex997064am price

• $27.99

specifications exhaustsnowmobilee:

• for models: Mach
• for makes: Skidoo, Ski-doo
• brand: Cometic
• mpn: Ex997064am
• part type: Gasket Exhaust

general exhaustsnowmobilee:

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

returns exhaustsnowmobilee:

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

seller exhaustsnowmobilee:

• city: Waterford, Michigan
• rating: 100.0%
• # reviews: 2235

payments exhaustsnowmobilee:

• wallet: Apple-pay
• other
• credit card: Visa

shipping exhaustsnowmobilee:

• class: Standard
• type: Fixed
• cost: $0.00
• transit: 4-9 Days
• service: Standard

offer exhaustsnowmobilee:

• quantity: 1
• sold: 0
• started: February 26, 2026
• availability: In Stock
• options: Ship-to-home

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