MBRP 4855-M373551-85 Performance Exhaust Cat

( Brand: Mbrp ), ( Manufacturer Part Number: 4855-M373551-85 ), ( Part Type: Exhaust )

Review MBRP Series Performance Exhaust Arctic Cat Le fits TRAIL MOUNTAIN 800 2002

The **MBRP 4855-M373551-85 Trail Performance Exhaust System** is a meticulously engineered aftermarket upgrade designed specifically for the **2002 Arctic Cat Mountain 800 LE**, delivering a harmonious blend of enhanced performance, refined sound, and uncompromising durability. Crafted from high-quality **409 stainless steel**, this exhaust system is built to withstand the rigors of off-road adventures, ensuring longevity even under the most demanding conditions. The **dual-tone finish** featuring a polished outer tube and a matte black inner liner offers both a sleek aesthetic and practical protection against corrosion, making it ideal for those who demand both style and substance.

At the heart of this exhaust lies a **high-flow design** optimized for improved engine efficiency, allowing for better airflow and reduced backpressure. This translates to a noticeable boost in **horsepower and torque**, enabling the Mountain 800 LE to accelerate more swiftly and maintain peak performance across varied terrains. The system incorporates a **catalytic converter bypass**, eliminating the restrictive flow restrictions found in stock setups while preserving emissions compliance where applicable. Additionally, the **precision-machined muffler** delivers a deep, resonant growl that enhances the already commanding presence of the Arctic Cat, satisfying both performance enthusiasts and purists who appreciate a well-tuned exhaust note.

Installation is streamlined with the **direct-fit construction**, requiring minimal modifications to the stock exhaust system. The **clamp-style mounting hardware** ensures a secure and leak-proof connection, while the **heat-shielded components** protect surrounding engine bay parts from excessive heat buildup. Whether tackling rocky trails, steep climbs, or long-distance rides, this exhaust system is engineered to perform consistently, reducing exhaust gas temperatures and minimizing the risk of overheating. For riders who seek a balance between **raw power, refined sound, and off-road resilience**, the MBRP 4855-M373551-85 Trail Performance Exhaust is the definitive choice a premium upgrade that elevates both the capability and character of the 2002 Arctic Cat Mountain 800 LE.

### **Pros and Cons of buying a MBRP 4855-M373551-85 Trail Performance Exhaust for a 2002 Arctic Cat Mountain 800 LE**

1. **Improved Sound and Tone** The exhaust is designed to enhance the engine s exhaust note, giving it a deeper, more aggressive sound while maintaining a level of tone that fits the Arctic Cat s stock character. This can be appealing for riders who enjoy a more pronounced exhaust sound without going overboard.

2. **Better Exhaust Flow and Backpressure Reduction** The Trail Performance exhaust is engineered to optimize exhaust gas flow, which can help reduce backpressure on the engine. This may lead to slightly improved throttle response and power delivery, especially in off-road conditions where exhaust restrictions can become more noticeable.

3. **Durability and Quality Construction** MBRP (Mountain Bike Racing Products) is known for producing high-quality aftermarket exhaust systems that are built to withstand the rigors of off-road use. The 4855 model appears to be constructed with heavy-duty materials, including stainless steel components, which should resist corrosion and damage from rocks, mud, and debris.

4. **Compatibility with Stock Components** The exhaust is designed specifically for the 2002 Arctic Cat Mountain 800 LE, meaning it should fit without major modifications. This includes proper mounting points, muffler placement, and exhaust pipe routing, reducing the risk of installation issues.

5. **Aesthetic Appeal** The Trail Performance exhaust has a sportier, more aggressive look compared to the stock exhaust. It may appeal to riders who want their bike to have a more customized appearance while still maintaining a functional design.

6. **Potential for Improved Cooling** A well-designed exhaust system can help with heat dissipation, which may contribute to slightly better engine cooling, especially in prolonged off-road use where exhaust heat can build up.

7. **Warranty and Support** MBRP offers warranties on their products, and their customer support is generally reliable. This provides peace of mind in case of manufacturing defects or installation issues.

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1. **Cost** Aftermarket exhaust systems like this one are more expensive than stock exhausts. The price point may be a significant investment for riders who are not heavily focused on performance or sound upgrades. The exact cost will depend on where you purchase it, but it will likely be at least double the price of an OEM exhaust.

2. **Potential Power Loss or Unpredictable Effects** While the exhaust is designed to reduce backpressure, some aftermarket exhausts can lead to minor power loss if not properly tuned. The Arctic Cat Mountain 800 LE is a naturally aspirated engine, and altering the exhaust system without tuning can sometimes result in a slight reduction in low-end torque or overall power. However, the Trail Performance exhaust is marketed as a "performance" system, so it may not have the same drawbacks as a straight-pipe exhaust.

3. **Installation Complexity** Installing an aftermarket exhaust requires removing the stock exhaust, which involves disconnecting the muffler, exhaust pipes, and possibly the catalytic converter (if equipped). This can be a labor-intensive process, especially for riders who are not mechanically inclined. It may also require welding or specialized tools if the stock exhaust is welded in place.

4. **Noise Regulations** Some areas have strict noise regulations for off-road vehicles. While the Trail Performance exhaust is designed to be louder than stock, it may still exceed legal limits in certain jurisdictions. Riders should check local laws before installing it to avoid fines or legal issues.

5. **Potential for Rust or Corrosion** Even high-quality exhaust systems can develop rust or corrosion over time, especially in wet or muddy conditions. The Arctic Cat Mountain 800 LE is often used in harsh environments, so the exhaust will need regular inspection and maintenance to prevent issues.

6. **Limited Availability of Parts** If something goes wrong with the exhaust system, finding replacement parts or a technician familiar with MBRP products may be more difficult than with OEM components. This could lead to longer downtime if repairs are needed.

7. **Stock Exhaust May Already Be Adequate** For many riders, the stock exhaust on the Arctic Cat Mountain 800 LE is perfectly adequate for its intended use. If the primary motivation for upgrading is performance, a more significant modification (such as a turbocharger or supercharger) might yield better results. If the goal is purely aesthetic or a subtle sound change, the stock exhaust may suffice.

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The MBRP 4855-M373551-85 Trail Performance exhaust is a well-regarded aftermarket upgrade for the 2002 Arctic Cat Mountain 800 LE, offering noticeable improvements in sound, exhaust flow, and durability. It is a solid choice for riders who want a balance between performance enhancement and a more aggressive aesthetic without committing to a full exhaust system overhaul. However, it is not a necessary upgrade for all riders, particularly those who prioritize simplicity, cost savings, or compliance with noise regulations.

The decision to install this exhaust should be based on your priorities: if you value a deeper exhaust tone, better flow, and a sportier look, and if you are prepared for the installation effort and potential cost, then it is a worthwhile investment. If, on the other hand, you are satisfied with the stock exhaust or prefer to focus on other modifications, then skipping this upgrade may be the better choice.

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- You enjoy a louder, more aggressive exhaust tone and want to enhance the bike s sound without going extreme.

- You ride in conditions where exhaust flow and cooling could benefit from a performance-oriented system.

- You are comfortable with the installation process and willing to invest in a higher-quality exhaust system.

- You appreciate the aesthetic improvements and want a more customized look for your Arctic Cat.

- You are on a tight budget and the stock exhaust meets your needs.

- You prioritize simplicity and do not want to deal with installation or potential maintenance issues.

- You ride in areas with strict noise regulations that may not allow the louder exhaust tone.

- You plan to focus on other modifications (such as suspension or engine upgrades) that may yield more significant performance gains.

For riders who are unsure, it may be worth researching user reviews or consulting with experienced Arctic Cat riders to get firsthand feedback on the exhaust s real-world performance. Additionally, if you decide to proceed, ensure you have the necessary tools and skills for installation, or hire a professional to avoid mistakes.

Details:

Compatibility: Years: Make: model: Application: Notes: 2003 - 2003 Arctic Cat Mountain Cat 800 EFI 144, 2002 Arctic LE 151, Cater EFI, 2001 8 900 Early Build, Son Pro, 9 2001 Arctic LE, 1M, Build.: Brand: MBRP, model Number: 4855-M373551-85. This is helpful if you are buying multiple items. Parts without fitment are to be assumed universal and may require vehicle modification.

MBRP Trail Series Performance Exhaust for 2002 Arctic Cat Mountain 800 LE 151: 2 Year warranty, Improved throttle response, Quick and simple installation, Huge weight savings, Made from 304 stainless, Uses stock springs hangers, Dino proven performance, Flo-bench tested back pressure. I need to exchange an item.

part #: 4855m37355185 price

• $364.99

specifications exhaustsnowmobilee:

• for models: 800, Trail, Mountain
• for makes: Arctic, Arctic-cat
• for years: 2002
• brand: Mbrp
• mpn: 4855-m373551-85
• part type: Exhaust

general exhaustsnowmobilee:

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

offer exhaustsnowmobilee:

• sold: 0
• started: February 26, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 7

seller exhaustsnowmobilee:

• rating: 99.8%
• # reviews: 78564
• city: Boise, ID

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

returns exhaustsnowmobilee:

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

shipping exhaustsnowmobilee:

• type: Fixed
• cost: $0.00
• service: Standard
• class: Standard
• transit: 2-5 Days

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