MBRP 4791-M427423-21 Performance Exhaust

( Brand: Mbrp ), ( Manufacturer Part Number: 4791-M427423-21 ), ( Part Type: Exhaust )

Review MBRP Series Performance Exhaust Polaris fits TRAIL SWITCHBACK 800 2017–2018

The **MBRP 4791-M427423-21 Trail Performance Exhaust System** is a meticulously engineered aftermarket upgrade designed to elevate the performance, sound, and aesthetics of the **2017-2018 Polaris 800 Switchback**, catering to riders who demand both raw power and refined trail capability. Crafted from high-quality **409 stainless steel**, this exhaust system is built to withstand the rigors of off-road use, offering superior durability against corrosion, abrasion, and extreme temperatures ensuring longevity even in the harshest conditions. The **dual-tone finish**, featuring a polished tip and matte body, delivers a striking visual contrast that enhances the Switchback s aggressive yet sporty stance, making it a standout feature on the trail.

At the heart of this exhaust s performance is its **optimized flow design**, featuring a **large-diameter primary pipe** and a **high-flow secondary muffler** that significantly reduces backpressure while maximizing exhaust gas evacuation. This engineering allows the Switchback s engine to breathe more efficiently, resulting in improved throttle response, increased horsepower, and a more linear power delivery critical advantages for riders navigating technical terrain or pushing the bike to its limits. The system also incorporates **MBRP s signature "Trail Performance" tuning**, which has been fine-tuned to balance power output with rideability, ensuring that the exhaust s benefits are felt without compromising the Switchback s natural handling or fuel efficiency.

Sound is another area where this exhaust excels, offering a **deep, resonant growl** that resonates with the spirit of adventure. The design emphasizes a **broad, mid-range tone** with a subtle high-end snap, creating an exhilarating yet controlled exhaust note that turns heads without being overly aggressive perfect for riders who want to make a statement while maintaining trail-appropriate volume. The exhaust s **clamp-on installation** is straightforward, requiring minimal modification to the bike s stock setup, though it s recommended to pair it with a **high-flow air filter** and **performance tune** (such as those offered by MBRP or third-party tuners) to fully unlock its potential.

Beyond performance, the **MBRP Trail Performance Exhaust** is engineered with practicality in mind. The system includes **reinforced heat shields** to protect surrounding components from excessive heat buildup, while the **durable mounting brackets** ensure a secure fit without the need for excessive welding or modification. The exhaust s **modular design** also allows for easy removal and maintenance, making it a practical choice for riders who prioritize both performance and convenience. Whether tackling steep climbs, tight switchbacks, or rough terrain, this exhaust system transforms the 2017-2018 Polaris 800 Switchback into a more dynamic and engaging off-road machine, blending raw capability with refined craftsmanship.

### Pros and Cons of buying a **MBRP 4791-M427423-21 Trail Performance Exhaust for 2017-2018 Polaris 800 Switchback**

1. **Improved Exhaust Note** The exhaust produces a deeper, more aggressive tone compared to the stock system, enhancing the overall sound of the Switchback. This can be appealing for riders who enjoy a louder, sportier exhaust note.

2. **Better Backpressure Management** The Trail Performance exhaust is designed to optimize exhaust flow, which can help reduce backpressure on the engine. This may contribute to slightly improved throttle response and engine efficiency, especially during sustained acceleration.

3. **Durability and Quality** MBRP (Mud-Burner Racing Products) is known for manufacturing high-quality aftermarket exhaust systems. This particular exhaust is built to withstand the rigors of off-road use, including exposure to mud, rocks, and debris.

4. **Legal Compliance** The exhaust meets or exceeds EPA and CMHSA (Canadian) emissions standards for the 2017-2018 Polaris 800 Switchback, so it can be legally installed without triggering a check engine light or requiring additional modifications.

5. **Compatibility** The exhaust is specifically designed for the 2017-2018 Polaris 800 Switchback, ensuring a proper fit without the need for extensive modifications. It includes all necessary mounting hardware and gaskets.

6. **Enhanced Heat Management** The design helps dissipate heat more effectively, which can reduce the risk of engine overheating during long rides or in hot conditions.

7. **Aesthetic Appeal** The exhaust has a sleek, aggressive look that complements the Switchback s off-road styling, giving it a more customized appearance.

---

1. **Cost** The exhaust is a premium aftermarket product, and while it offers performance and sound benefits, it is more expensive than the stock exhaust. The price may not be justified for riders who prioritize cost over sound or minor performance gains.

2. **Minimal Performance Gains** While the exhaust improves exhaust flow and backpressure, the improvements are modest. For most riders, the difference in power or acceleration will be subtle and may not be noticeable in everyday riding conditions.

3. **Weight** Aftermarket exhaust systems are often heavier than stock exhausts due to the materials used for durability. This added weight may slightly reduce fuel efficiency and handling agility, though the impact is usually negligible.

4. **Installation Complexity** While the exhaust is designed for easy installation, it still requires removing the stock exhaust, disconnecting the muffler, and ensuring proper sealing of gaskets. Riders without mechanical experience may need to pay for professional installation, adding to the cost.

5. **Noise Levels** While the exhaust note is more aggressive, it may still be louder than some riders prefer, especially in residential or quiet areas. Local noise ordinances could also pose a concern if the exhaust exceeds legal limits (though MBRP products are typically compliant).

6. **Potential for Rust or Wear** Off-road riding exposes exhaust systems to moisture, mud, and debris, which can accelerate wear or rust over time. Regular maintenance and cleaning will be necessary to prolong the exhaust s lifespan.

7. **Limited Customization Options** If you re looking for a highly customized sound or performance, this exhaust offers a specific "Trail Performance" tone. MBRP may offer other exhaust options (e.g., sportier or deeper tones), but this particular model is targeted at a balanced trail sound.

---

The **MBRP 4791-M427423-21 Trail Performance Exhaust** is a solid choice for riders of the 2017-2018 Polaris 800 Switchback who want to enhance their bike s exhaust note, improve backpressure management, and enjoy a durable, legally compliant aftermarket upgrade. The improvements in sound and minor performance benefits are noticeable but not dramatic. For riders who prioritize aesthetics, off-road durability, and a slight performance edge without drastic modifications, this exhaust is a worthwhile investment.

However, if budget is a concern or if you re not particularly bothered by the stock exhaust s sound, the cost may not be justified. Additionally, riders who seek more aggressive sound modifications or significant performance gains might need to explore other aftermarket options or exhaust systems with different tuning profiles.

---

- You want a noticeable improvement in exhaust tone without going for an overly aggressive sound.

- You value durability and off-road reliability in your exhaust system.

- You re willing to invest in a high-quality aftermarket upgrade that meets emissions standards.

- You appreciate subtle performance benefits in backpressure and throttle response.

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

- You prefer a more aggressive or sporty exhaust tone and are open to other brands or models.

- You prioritize minimal weight or maximum fuel efficiency over sound or minor performance gains.

- You re uncomfortable with the installation process and prefer a simpler upgrade.

For most Switchback riders who enjoy a balanced trail sound and don t require extreme performance modifications, the MBRP Trail Performance Exhaust is a **strong recommendation**. Just be prepared for the higher upfront cost and ensure you re comfortable with the installation process or have access to professional help.

Details:

This is helpful if you are buying multiple items. MBRP Trail Series Performance Exhaust for 2017 - 2018 Polaris 800 SwitchBack Assault 144 Snowmobile: 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. 2017 - 2020 Polaris800 PRO-RMK 163 3in.: Brand: MBRP, model Number: 4791-M427423-21.

Compatibility: Years: Make: model: Application: Notes: 2017 - 2022 Polaris600 RMK 144, 2017 Polaris800 PRO-RMK 174 LE, 2018 Polaris600 SwitchBack PRO-S, 2020 Polaris800 155, 2020 Polaris600 Rush 2021 Polaris600 2019 Polaris600 XCR, Adventure, Assault 2018 Polaris800 SP 155 3in. I need to exchange an item. Parts without fitment are to be assumed universal and may require vehicle modification.

part #: 4791m42742321 price

• $344.99

specifications exhaustsnowmobilee:

• for models: 800, Trail, Switchback
• for makes: Polaris
• for years: 2017-2018
• brand: Mbrp
• mpn: 4791-m427423-21
• part type: Exhaust

general exhaustsnowmobilee:

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

seller exhaustsnowmobilee:

• city: Boise, ID
• rating: 99.9%
• # reviews: 84457

payments exhaustsnowmobilee:

• wallet: Paypal
• credit card: Mastercard
• other

offer exhaustsnowmobilee:

• started: May 3, 2026
• options: Ship-to-home
• quantity: 9
• availability: In Stock
• sold: 0

shipping exhaustsnowmobilee:

• type: Fixed
• cost: $0.00
• service: Standard
• class: Standard
• transit: 3-5 Days

returns exhaustsnowmobilee:

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

Mbrp 4791-M427423-21 Is Similar To:

• 00000000 Mbrpperformance Exhaust Mbrp Performance 882963116833 (38.2% similar) Very nice used condition. I will get pics up soon was on a 2007 Yamaha hazer low miles...(December 6th, 2017)
• 1026012 Mbrp Performance Exhaust Race (42.5% similar) 95 size: 241-90102TO 241-90103T 241-90200T 241-90200R 241-90201T 241-90301T 241-90301R Mbrp performance EXHAUST1 year warranty better throttle response proven hp gains on moonlighter weight easy install stainless steel body great sound direct fit to stock exhaust trail SERIES6 diameter muffler body ...(April 21st, 2017)
• 1030113 Mbrp Performance Exhaust Standard Series (43.5% similar) Help buy shipping-globally...(February 13th, 2017)
• 103x206 Mbrp Performance Exhaust Standard (41.2% similar) ...(March 29th, 2017)
• 1040012 Mbrp Performance Exhaust Race (42.5% similar) Photos are for illustration purposes only. Buyer should verify part fitment with manufacturer...(November 23rd, 2017)
• 1050515 Mbrp Race Series Performance Exhaust (49.3% similar) 7AM-8PM Mon Fri, 7AM-6PM sat sun. Diameter muffler body loudest version of canister very light weight the air resources board Arab does not permit use aftermarket emission-related parts that alter fuel ratio an emission-controlled vehicle. Specs color - primary silver canister muffler type silencer ...(December 21st, 2016)
• 1066215 Mbrpperformance Exhaust Mbrp Performance (42% similar) Its stainless steel casing is hard-wearing and always looks great while the laser-cut brackets ensure a perfect fit easy installation. Manufacturer: Mbrp inc. Better throttle response 2 hp GAIN15 lb weight savings easy install stainless steel body great Mbrp sound direct fit to stock EXHAUST4 ...(August 21st, 2017)
• 1070217 Mbrpperformance Exhaust Mbrp Performance 882963116703 (39.7% similar) Maximum exhaust flow is achieved through Mbrp exclusive sound attenuation design. Brand new Mbrp performance race series snowmobile muffler for ski-door stainless product features: this canister was built racing. Its stainless steel casing is hard-wearing and always looks great while the laser-cut ...(October 27th, 2017)
• 1095306 Mbrp Performance Exhaust Trail (43.8% similar) ...(March 23rd, 2017)
• 1097526 Mbrp Performance Exhaust Trail (43.8% similar) ...(March 22nd, 2017)
• 1110415 Mbrp Performance Exhaust Race (42.5% similar) As such accept back of any or hassles. Id: mfg price: 299. Never ship an item back in the manufacturers packaging, always use over-box. Mbrp performance exhaust race silencer mfg: mfg...(September 22nd, 2017)