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This product is legal only for closed course competition use and is not legal for vehicles used on the street or even for off-highway vehicles which have a vehice emissions control label.
Yoshimura RS-9 Race Exhaust System Honda Grom MSX125
The same Yoshimura exhaust system deigned for AMA Pro Supercross and Motorcross competition is now available for the Honda Grom. The RS-9's parallelogram-shaped muffler body increases muffler volume over the stock system, resulting in better throttle response and improved noise cancellation. The uniquely sculpted Carbon Fiber end-caps feature a Tunable Insert System, able to fine-tune power delivery and decibel levels to rider specifications.
Polished 304-L Stainless Steel
Lightweight laser cut rivet-bands
Premium quality closed-end rivets reinforced
Made In USA
Note: Please check local laws before purchasing. Some modifications may be prohibited in some states.
Worth the weight alone
Looks trick, sounds great, and super light, especially compared to the stock grom pipe!
February 1, 2015
Great look, great sound
I bought the carbon fiber Yoshimura Full Exhaust and couldn't be happier. It looks great, sounds awesome, and gives me a little extra performance to play with. All in all, it was a great purchase and one that I would make again if I had to.
July 28, 2014
Most refined sound from a Grom
Couldn't be easier it install! Did it in the entrance way of my 600sq.ft apartment. There are cheaper systems out there but this one looks like a million bucks. And the sound is super refined; not ridiculous. Serious performance gains particularly when you do a ram air intake as well.
July 7, 2014
awesome looks fantastic and sounds mean, its not overly loud either
Sounds great and is not too loud. The carbon fiber looks fantastic. Delivery was fantastic and fast.
June 12, 2014
Have a functionality, fit, or otherwise product-specific question about the Yoshimura RS-9 Race Exhaust System Honda Grom 2014-2015? Ask it here!
If you have a customer service or shipping question, please direct it to our Customer Service department.
M E:I never used a fuel injection controller and my bike runs great. I have the carbon full system. I noticed a fair amount of power gain at low rpms. When I first installed my exhaust I lost a couple mph top end ( literally 2mph) but the bottom end gain was a fair trade. Over time though, the top end came back. The sound is great!Mar 11, 2014
Scott W:No you do not. I installed mine and have ridden almost 1000 miles with it on the stock fuel map. The ECU will make minor adjustments to the engine to accommodate the better exhaust flow. Unless you are adding a big-bore kit or significantly changing the engine, you will be fine.Mar 10, 2014