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Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016
  • Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016
  • Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016
  • Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016
  • Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

Two Brothers S1R Exhaust System Yamaha FZ-09

The Two Brothers S1R Slip-On Exhaust represents a step into the future for TBR. The S1R exhaust features a carbon fiber sleeve highlighted by a natural aluminum outlet and stamped, spring-mounted inlet for the ultimate durability. Like most TBR mufflers, the end cap of the S1R exhaust is constructed of magnesium and features a non-stick teflon coating. However, that is where the similarities end.

The aggressive design of the end cap is reminiscent of the modern jet engine making this exhaust move at mach 1 speeds while standing still. The carbon fiber sleeve of the S1R exhaust system is made of a 33 million modulus rated carbon fiber that is impregnated with high temperature resin, under very tight tolerances. Thirty-three million modulus rated carbon fiber can be considered the Goldilocks of carbon fiber , it has strong structural properties without being overly stiff and brittle, making it just right.

The sound produced by the S1R is deep and throaty thanks to its spiral-wound perforated core technology. The rubber-lined, natural finished aluminum muffler clamps feature an aggressive angular design and cutouts to reduce weight. The mid-pipe is constructed from .035” thick 304 stainless steel. After a few heat cycles the 304 steel turns a golden amber color, the hallmark of quality stainless. Of course an exhaust can't be all show and no go, that is why the S1R exhaust is track-tested and dyno-tuned to offer the best performance package.


  • Fully-serviceable in the event of damage, routine maintenance or the occasional repack
  • Aerospace high-temp carbon fiber
  • Stamped spring-fit inlet
  • Optional P1 and PX1 sound inserts available (sold separately)
  • Optional anodized bolts kits available (sold separately)
  • Made in USA
Unit Stock Exhaust Two Brothers Max Gain
Max Power HP 107.65 114.55 + 6.9
Max Torque ft-lb 61.19 63.94 + 2.75
Weight lb 18 8 - 10
Sound Level db 91.5 99 + 7.5


This Product Fits:
FZ-09 2014, 2015, 2016
Product Style RevZilla Item # Manufacturer Product # Availability
Aluminum / Full System 966225 005-3790106-S1 Out of Stock
Carbon Fiber / Full System 938460 005-3790105-S1/ In Stock: Ships within 24 hours


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Write a Product Review for a chance to win our monthly $100 giveaways.
Two Brothers S1R Exhaust System Yamaha FZ-09 2014-2016 5 5 2 2
LOUD The exhaust is awesome, point blank. I think it sounds better than the Akropvic (Had a guy with a FJ start his and it wasn't what I was looking for) The SR1 has a deeper sound to it but its still freaking loud. Way better than I thought it was going to be. I also installed a Power Commander with it since I modded the air box and changed the filter (Highly recommend). I don't have a dyno accessible so I cant give you numbers. All I will say is buy this exhaust and you wont be disappointed. April 22, 2016
Looks good It was really easy to install. The only tough part is that you really need to have a tuner installed and have it mapped on a dyno. If not the bike will run very lean. I have the Bazzaz and Two Bros. Dynos out at 68hp /110ft lbs. The sound is incredible. A little loud on long rides but nothing a good set of plugs won't solve. I am very happy with this setup! April 11, 2015
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