After researching manufacturer specifications, industry standards, and aggregated owner feedback, we compared the top exhaust systems for four wheelers. Our evaluation focuses on performance gains, build quality, ease of installation, and real-world durability. Below are our picks for various needs and budgets.
| Photo | Product | Score | Buy |
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Yoshimura RS-9 Full Exhaust System Top Pick Stainless steel header, aluminum muffler, 2.25 inch diameter |
9.2 | 🛒 Check Price |
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HMF Racing Optimizer Series Exhaust Best Value T-304 stainless steel, comes with quiet core insert |
8.8 | 🛒 Check Price |
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FMF Racing Powercore 4 Exhaust Best for Trail Riding Aluminum muffler, stainless steel headpipe, USFS approved |
8.5 | 🛒 Check Price |
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Pro Circuit T-6 Full Exhaust System Best for Racing 304 stainless steel header, aluminum muffler, 2.25 inch diameter |
9.0 | 🛒 Check Price |
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Dynojet Power Vision 3 Exhaust Tuner Kit Best Tuner Kit Includes tuner display and pre-loaded maps for select exhausts |
8.2 | 🛒 Check Price |
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Big Gun EVO Full System Exhaust Loudest Option Stainless steel header, aluminum silencer, 2.25 inch diameter |
7.8 | 🛒 Check Price |
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Two Brothers Racing M-2 V.A.L.E. Exhaust Sleek Design Carbon fiber end cap, aluminum canister, stainless steel mid-pipe |
7.3 | 🛒 Check Price |
1. Yoshimura RS-9 Full Exhaust System: Top Pick
The Yoshimura RS-9 is a top-tier exhaust system that delivers measurable performance improvements. Based on owner feedback and the spec sheets, it adds substantial horsepower while reducing weight. The stainless steel header and aluminum muffler resist corrosion well, and the included spark arrestor makes it trail-legal in most areas.
However, the RS-9 is one of the more expensive options, and its aggressive sound may not suit everyone. Riders looking for a budget-friendly upgrade or a quieter exhaust should consider other picks. It also requires careful jetting or ECU tuning to realize full gains.
- Tuned for maximum mid-range and top-end power on sport four wheelers
- Lightweight construction reduces overall vehicle weight
- Includes spark arrestor and meets USFS sound requirements
Pros: Significant horsepower gains across the powerband; Excellent build quality and fitment
Cons: Higher price point compared to some competitors
2. HMF Racing Optimizer Series Exhaust: Best Value
The HMF Optimizer series offers a strong balance of performance and affordability. Our research shows it provides noticeable gains in low-end torque and throttle response, making it ideal for trail riding. The T-304 stainless steel construction holds up well, and the quiet core insert allows riders to comply with noise regulations.
On the downside, some owners report that the ceramic coating can fade or discolor after prolonged use. This exhaust is not the best choice for those seeking maximum top-end horsepower or a show-quality finish. It is a solid mid-range performer that delivers good value.
- Optimized for torque and throttle response
- Quiet core insert included for noise-sensitive areas
- Direct bolt-on installation with no modifications needed
Pros: Great power improvement for the price; Versatile with included quiet core
Cons: Finish may discolor over time with extreme heat
3. FMF Racing Powercore 4 Exhaust: Best for Trail Riding
The FMF Powercore 4 is a popular choice among trail riders who need reliable performance. According to owner feedback, it provides a smooth power delivery that improves low-end grunt without sacrificing too much top-end. The USFS-approved spark arrestor makes it legal in many riding areas, and the build quality is solid.
However, the Powercore 4 is not the best performer for racing or high-speed applications. Riders seeking maximum horsepower gains or a deeper exhaust note may prefer other options. It also comes at a moderate price point that may not appeal to budget-conscious buyers.
- Designed for broad power delivery suitable for technical trails
- Lightweight aluminum muffler reduces weight
- USFS approved spark arrestor included
Pros: Smooth, manageable power curve; Durable construction with good corrosion resistance
Cons: Not the loudest option for those wanting aggressive sound
4. Pro Circuit T-6 Full Exhaust System: Best for Racing
The Pro Circuit T-6 is a race-oriented exhaust that delivers outstanding top-end power. Based on manufacturer specs and owner reviews, it offers significant gains in the upper RPM range, making it ideal for competitive riding. The construction is robust, with a stainless steel header and aluminum muffler that withstands harsh conditions.
That said, the T-6 is not the best for casual trail riders who prioritize low-end torque. It also comes at a premium price and typically requires carburetor or ECU adjustments to run optimally. Riders on a budget or those who prefer a plug-and-play system should look elsewhere.
- Designed for high-RPM power and race applications
- Proven on professional racing circuits
- Includes removable spark arrestor for trail use
Pros: Exceptional top-end horsepower; Race-proven durability
Cons: Expensive and may require jetting changes
5. Dynojet Power Vision 3 Exhaust Tuner Kit: Best Tuner Kit
The Dynojet Power Vision 3 is not an exhaust itself but a tuning kit that optimizes performance when paired with an aftermarket exhaust. Our evaluation shows it provides substantial gains by adjusting fuel and timing maps. The touchscreen interface is intuitive, and pre-loaded maps simplify the process.
However, this kit adds extra cost and complexity. Riders who are not comfortable with tuning may find it overwhelming. It also does not include an actual exhaust system, so it is best suited for those who already have or plan to buy a compatible exhaust. For a simple bolt-on solution, this is not the right choice.
- Allows custom tuning for exhaust and intake modifications
- Includes pre-loaded maps for popular exhaust systems
- Touchscreen interface with real-time data monitoring
Pros: Unlocks full potential of aftermarket exhausts; User-friendly software and easy data logging
Cons: Requires some technical knowledge to use effectively
6. Big Gun EVO Full System Exhaust: Loudest Option
The Big Gun EVO is designed for riders who want a loud, aggressive exhaust. According to owner feedback, it provides a deep bark and noticeable power gains in the mid to top end. The stainless steel header and aluminum silencer are decently built, and a spark arrestor is included.
However, the extreme noise level can be a drawback. Many riding areas enforce strict noise limits, and this exhaust may not be compliant. Durability is also a concern, as some owners report cracking at welds after extended use. Riders who prioritize quiet operation or long-term reliability should skip this one.
- Extremely loud exhaust note for aggressive sound
- Improves mid-range and top-end power
- Includes spark arrestor
Pros: Very loud and aggressive sound; Noticeable power gains
Cons: May exceed noise limits at some tracks or trails
7. Two Brothers Racing M-2 V.A.L.E. Exhaust: Sleek Design
The Two Brothers Racing M-2 V.A.L.E. exhaust stands out for its carbon fiber end cap and sleek styling. Our research indicates it offers a subtle sound improvement and minor power gains. Installation is straightforward, and the build quality is acceptable for casual riders.
However, performance enthusiasts may be disappointed with the small gains. Durability is also a concern, as the carbon fiber can crack if impacted. This exhaust is best for riders who prioritize aesthetics over raw performance. For serious power seekers, other options provide better value.
- Unique carbon fiber end cap for a custom look
- Slightly deeper sound than stock
- Easy bolt-on installation
Pros: Attractive appearance with carbon fiber accent; Simple installation process
Cons: Modest performance gains compared to others
Frequently Asked Questions
Will an aftermarket exhaust void my four wheeler warranty?
In most cases, installing an aftermarket exhaust does not automatically void the entire warranty. However, if the exhaust causes damage to the engine or other components, the manufacturer may deny a related warranty claim. We recommend checking your vehicle’s warranty terms and keeping the original parts for reinstallation if needed.
Do I need to rejet my carburetor or tune my ECU after installing a new exhaust?
Often yes, especially with a full exhaust system. Changing the exhaust alters the air-fuel ratio, and the stock fuel map may not be optimal. Many riders experience improved performance after rejetting or tuning. Some exhausts come with tuning recommendations or include a tuner. Failure to adjust can lead to lean conditions and potential engine damage.
How loud is too loud for trail riding?
Noise regulations vary by location, but many public trails enforce limits around 96-99 dB. Exhausts like the Big Gun EVO can exceed 100 dB, which may get you cited or banned. We recommend checking local rules and choosing an exhaust with a removable quiet core or a sound level under 98 dB for trail use.
What is the difference between a slip-on and a full exhaust system?
A slip-on replaces only the muffler and mid-pipe, while a full system replaces the entire exhaust from the header to the tip. Full systems generally offer greater performance gains but are more expensive and require more installation effort. Slip-ons are easier to install and provide a modest sound and power improvement.
How do I know if an exhaust will fit my four wheeler?
Check the manufacturer’s fitment list for your specific make and model. Most reputable brands provide detailed compatibility information. Also verify the year and engine size. If unsure, contact the seller or manufacturer directly. Installing an incompatible exhaust can cause poor performance or damage.
Our Verdict
After researching and comparing the top exhaust systems, our top pick is the Yoshimura RS-9 for its outstanding performance and build quality. The runner-up is the HMF Racing Optimizer Series, which offers excellent value and versatility for trail riders.
