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Two Brothers S1R Exhaust System Honda GROM 2014
  • Two Brothers S1R Exhaust System Honda GROM 2014
  • Two Brothers S1R Exhaust System Honda GROM 2014
  • Two Brothers S1R Exhaust System Honda GROM 2014
  • Two Brothers S1R Exhaust System Honda GROM 2014

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Two Brothers S1R Exhaust System Honda GROM MSX125

With a special bike like the Honda Grom comes an all-new exhaust from Two Brothers Racing was created. The innovative carbon fiber S1-R exhaust will turn heads with a new design that has been developed to increase the horsepower by 10 percent and reduce weight by 5.5 pounds over the stock exhaust. The S1-R is also fitted with a lightweight spiral wound perforated core and high performance sound absorption packing material. With noticeable horsepower gains, a lighter overall weight and that striking TBR sound, your Honda Grom will get noticed at the next Honda Grom Prix.


  • Machined spring retained connection
  • High-performance packing material
  • CNC billet black muffler bracket
  • CNC billet machined outlet
  • Lightweight magnesium end cap
  • Includes a removable P1X power tip

Note: Please check local laws before purchasing a Two Brothers Exhaust. Some modifications may be prohibited in some states.


This Product Fits:
Grom MSX125 2014
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5 5 2 2
Two Brothers Exhaust Honda Grom Excellent Product. 15 minute install and that is including getting the tools out and putting them away. Significantly lighter then the OEM exhaust. The sound is fantastic and after a couple wide open freeway runs the bike easily broke into the 60mph range, routinely touching 65+ mph. Really opened the bike up and the sound is amazing! March 10, 2014
A great upgrade for the Honda Grom! Overall I really like the stock look of the Honda Grom and never planned on making too many mods. Visual: When I saw the Two Brothers S1R Exhaust System, I thought it enhanced the look of the bike without radically changing any lines / characteristics. The choice of materials used and the simplified mounting really gives the bike a more premium feel. The carbon fiber looks sick in real life. Sound: My only concern was I did not want something obnoxiously loud. There are videos posted online of the sound you can expect from this exhaust, but it is hard to judge the volume. Luckily, it is just right. The exhaust is louder but not extreme. It has a really gnarly growl to it. I feel like the noise definitely matches the Honda Groms attitude. Performance: The Grom definitely feels like a new animal with this exhaust installed. I feel like the chart is accurate with its performance claims. What the chart can not summarize is how the new exhaust sound will also make you feel like you're going faster. Its truly awesome. Conclusion I without a doubt recommend this product. I feel it brings the Honda Grom to the next level in all aspects an exhaust system can ( sight, sound, performance). February 25, 2014
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Two Brothers S1R Exhaust System Honda GROM 2014
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RevZilla Store asked: Why did you choose this?
yadira t: its awsome an great price Apr 15, 2014
Product Style RevZilla SKU ID Manufacturer Product # Availability
Carbon Fiber 935688 005-3740105-S1 In Stock: Ships within 24 hours