*Product may vary by application
Emissions Compliance Declaration: QUALIFIED MANUFACTURER DECLARED "MODIFIED PART"
WARNING: Cancer and Reproductive harm - www.p65warnings.ca.gov
Description
It's here - the third generation Honda Grom. Back in 2013, we couldn't wait for the OG model to arrive on US shores and the newest version has us with equal anticipation.
With more compression, a 5 speed gearbox and new styling, the latest generation Grom promises even more fun both on the street and at the racetrack... Yoshimura is ready.
For styling, power and clearance we developed our renowned RS-9T to perform on the third gen Grom and the results are incredible, as the new Grom responded like a champ. Our Race Series RS-9T full system adds a staggering 13.9% max HP increase and 14.3% increase in max torque. With performance like that it's safe to say the RS-9T will be on top of the track day podiums around the globe!
We didn't stop there, we designed our RS-9T to offer more ground clearance and lean angle than the previous gen model. For the cherry on top we added a matte carbon fiber end cap and heat shield - Now your new Grom will love you forever!
If your serious - it's only Yoshimura. Proudly made in the USA!
- RS-9T muffler allows the use of 5 sound insert options to customize power delivery and sound reduction.
- Inserts available:
SA-15-K
SA-14-K
INS-RS9A-K
INS-RS9B-K
INS-RS9C-K
*SPECIAL FITMENT NOTE: Not Compatible with 2025 SP Models Lower Cowling as it interferes with cowling and cowling bracket.
Sound Insert/Spark Arrester Options
|
Sound Level
|
Volume Insert | Spark Arrestor | Included |
 |
INS-RS9B-K | No |
|
 |
INS-RS9C-K | No |
|
 |
|
SA-15-K | No |
. . . . .
This product was designed to fit on a standard equipped motorcycle, as delivered from the factory. OE and aftermarket accessories not found on a bike as delivered from the factory may not be compatible with this product.
Attention international customers: This product was designed and tested to be compatible with vehicles in the U.S. marketplace only. Compatibility, including fitment and performance, may vary by marketplace.
Works Finish Explained
New Yoshimura Works Finish takes on a unique coloring after it goes through a heat cycle on the motorcycle that looks much like those titanium works components our factory racers use.
- Contemporary Satin/matte finish
- Uniform heat coloration
- Increased fatigue strength
- Increased scratch and stain resistance
Instructions
Instructions / What's Included PDFVehicle Fitment
Customer Reviews
It's loud!
Very satisfied with my purchase exactly what I imagine it sounds like. Great products
I put the RS-9T on my otherwise stock ’23 Grom.
Immediately there was a noticeable increase in power at lower gears and at least +6mph top speed.
Incredible gains for just four bolts.
What an incredible difference when I changed to the full exhaust. Veryy easy to install on my 2025 honda grom and the sound is amazing. Make sure u don't have the belly cover on the grom. Not compatible yet like the website says. Look and sounds awesomeee!! Thx guys!!!
I thought…a little pricey,but having bought and used yoshimura products over the years it’s gonna be worth it? And they didn’t disappoint.There is absolutely a difference between this product and any aftermarket brand.Fit,finish ease of installation and after that performance.Very satisfied with the purchase.