After researching manufacturer specifications, industry standards, and aggregated owner feedback, we compared the best Honda Grom exhaust systems that offer the most value for your money. Our evaluation focuses on performance gains, build quality, ease of installation, and real-world owner satisfaction. Whether you want a deep tone or maximum horsepower, we have a pick for you.
| Photo | Product | Score | Buy |
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Yoshimura RS-9 Stainless Steel Full Exhaust Best Overall Full system, stainless steel, 304L, 2.5 lb weight savings |
9.2 | 🛒 Check Price |
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FMF Q4 Slip-On Exhaust Best Sound Slip-on, stainless steel / aluminum, with removable spark arrestor |
8.7 | 🛒 Check Price |
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Vance & Hines CS One Exhaust Best Value Full system, carbon fiber can, stainless steel header |
8.4 | 🛒 Check Price |
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Two Brothers Racing M-2 Slip-On Exhaust Popular Pick Slip-on, aluminum can, stainless steel mid-pipe |
8.1 | 🛒 Check Price |
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M4 Street Slayer Full Exhaust Performance Pick Full system, stainless steel, with carbon fiber end cap |
8.9 | 🛒 Check Price |
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Delkevic Stainless Steel Slip-On Exhaust Budget Friendly Slip-on, stainless steel, 12-inch can |
7.8 | 🛒 Check Price |
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Zoom Brute Exhaust System Off-Road Choice Full system, stainless steel, with spark arrestor |
7.3 | 🛒 Check Price |
1. Yoshimura RS-9 Stainless Steel Full Exhaust: Best Overall
The Yoshimura RS-9 is a top-tier full exhaust system that delivers consistent performance gains. In our evaluation based on dyno charts and owner feedback, it adds 2-3 horsepower when paired with a fuel controller. The stainless steel construction is durable and the sound is deep and refined. However, the premium price may deter budget-conscious buyers, and those seeking a loud, raspy tone might find it too tame.
This exhaust is ideal for riders who want a proven, reliable upgrade without sacrificing quality. If you are on a tight budget or prefer an ultra-loud exhaust, consider the next picks.
- Proven power gains of 2-3 hp with proper tuning
- Deep, aggressive exhaust note without being obnoxious
- High-quality 304L stainless steel construction resists corrosion
Pros: Excellent build quality and fitment; Noticeable performance improvement; Great sound quality
Cons: Higher price point than some competitors
2. FMF Q4 Slip-On Exhaust: Best Sound
The FMF Q4 is a favorite among Grom owners for its deep, throaty sound. Based on owner feedback, the Q4 provides a noticeable improvement over stock without being excessively loud. The slip-on design makes installation straightforward, and the removable spark arrestor adds versatility for off-road riding. However, power gains are minimal without a header upgrade, and some riders report a slight loss of low-end torque.
This exhaust is best for riders who prioritize sound quality and ease of installation over maximum horsepower. If you are chasing peak performance, a full system may be a better investment.
- Rich, deep tone with a removable spark arrestor for off-road use
- Retains stock header for easier installation
- Lightweight aluminum end cap saves weight
Pros: Excellent sound quality; Easy slip-on installation; Spark arrestor included
Cons: Modest power gains compared to full systems
3. Vance & Hines CS One Exhaust: Best Value
The Vance & Hines CS One offers an attractive price point for a full exhaust system. In our comparison, it provides decent power gains and a sporty exhaust note that many owners appreciate. The carbon fiber end cap adds a custom look, but some users report discoloration after extended use. Installation is straightforward, though the header may require careful alignment to avoid contact with the frame.
This is a solid choice for budget-minded riders who want a full system. If you prioritize long-term durability or a perfect fit, you might want to spend a bit more.
- Affordable full system with carbon fiber end cap
- Saves over 3 pounds compared to stock
- Produces a sporty, aggressive exhaust note
Pros: Great value for a full system; Weight reduction; Sporty sound
Cons: Carbon fiber can may discolor over time; Fitment can be tight on some models
4. Two Brothers Racing M-2 Slip-On Exhaust: Popular Pick
The Two Brothers Racing M-2 is a popular slip-on option known for its dual outlet design. Based on owner feedback, it offers a crisp exhaust note that can be tuned via the removable baffle. The aluminum can keeps weight low, but the finish may show wear after a season. Fitment is generally good, though a few users needed to tweak the mounting bracket.
This exhaust appeals to riders who want a unique look and adjustable sound. If you prefer a more proven, durable finish, consider other options.
- Unique dual outlet design for a distinctive look
- Lightweight aluminum construction
- Includes a removable baffle for sound adjustment
Pros: Distinctive styling; Adjustable sound; Good weight savings
Cons: Some owners report fitment issues; Finish may fade over time
5. M4 Street Slayer Full Exhaust: Performance Pick
The M4 Street Slayer is a performance-oriented full system that delivers impressive power gains. In our research, dyno results show up to 3-4 horsepower increases when tuned correctly. The exhaust note is loud and aggressive, appealing to those who want to be heard. However, the noise level may attract unwanted attention or violate local sound ordinances. Additionally, a fuel controller is highly recommended to prevent a lean condition.
This exhaust is perfect for performance enthusiasts who don’t mind a loud bike. If you prefer a quieter ride or don’t plan to tune, look elsewhere.
- Designed for maximum horsepower gains with proper tuning
- Loud, aggressive exhaust note
- Includes a removable dB reducer
Pros: Top-tier performance gains; Aggressive sound; Lightweight
Cons: Very loud, may be too loud for some; Requires tuning to avoid running lean
6. Delkevic Stainless Steel Slip-On Exhaust: Budget Friendly
The Delkevic slip-on is among the most affordable exhaust upgrades for the Grom. Based on owner feedback, it provides a modest improvement in sound and weight savings. The stainless steel construction offers decent durability for the price. However, power gains are minimal and the exhaust note can be somewhat raspy compared to premium brands. Some owners also report that the included mounting hardware is not the best.
This is a great entry-level option for riders on a strict budget. If you want maximum performance or a refined sound, you may want to invest more.
- Very affordable slip-on option
- Stainless steel construction for durability
- Available in multiple can lengths and finishes
Pros: Lowest price point; Good build quality for the price; Multiple options
Cons: Modest power gains; Sound may be raspy to some ears
7. Zoom Brute Exhaust System: Off-Road Choice
The Zoom Brute exhaust is aimed at off-road Grom riders who need a spark arrestor. In our evaluation, it offers a deep exhaust note and seems durable enough for trail use. However, several owners report fitment challenges, particularly with the header alignment. The finish is also less polished than higher-end options, and some welds appear rough.
This exhaust is best for off-road focused riders who need a spark arrestor and are willing to deal with potential fitment issues. For street use, other options offer better quality and easier installation.
- Designed for off-road use with included spark arrestor
- Rugged construction to withstand abuse
- Produces a deep, throaty sound
Pros: Spark arrestor included for off-road; Rugged build; Deep sound
Cons: Fitment issues reported; Less refined finish
Frequently Asked Questions
Do I need to tune my Honda Grom after installing an exhaust?
For most aftermarket exhausts, especially full systems, tuning is recommended to optimize performance and prevent a lean air-fuel mixture. Slip-on exhausts may not require tuning, but a fuel controller or ECU flash will help you get the most power and smoothness. Always check the manufacturer’s recommendations.
Will an exhaust void my Honda warranty?
An aftermarket exhaust alone does not automatically void your warranty. However, if the exhaust causes damage to other components, those repairs may not be covered. The Magnuson-Moss Warranty Act protects consumers, but it’s best to check with your dealer.
How much horsepower can I expect from a Grom exhaust?
Typically, a full exhaust system with proper tuning can add 2-4 horsepower on a Honda Grom. Slip-on exhausts offer minimal gains, often less than 1 hp. Actual results vary based on the specific exhaust and supporting modifications.
What is the loudest Honda Grom exhaust?
Exhausts like the M4 Street Slayer and Two Brothers Racing M-2 are known for being loud. However, loudness can be subjective and depends on the baffle configuration. Always check local noise regulations before choosing an exhaust.
Can I install a Grom exhaust myself?
Yes, most slip-on exhausts are easy to install with basic hand tools. Full systems require more effort and may need some mechanical experience. Many owners successfully install their exhausts in a garage, but if you are unsure, professional installation is recommended.
Our Verdict
After our research and comparison, the Yoshimura RS-9 stands out as the best Honda Grom exhaust for the money, offering a perfect balance of performance, quality, and sound. For those on a tighter budget, the Vance & Hines CS One provides excellent value as a full system. Choose based on your priorities: sound, performance, or cost.
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