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Two Brothers S1R Slip-On Exhaust Kawasaki Ninja ZX-6R / ZX-636
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.
Features:
- 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 | 112.7 | 120.6 | + 7.9 |
Max Torque | ft-lb | 45.6 | 47.1 | + 1.5 |
Weight | lb | 25 | 9 | - 16 |

Resources:
Product Style | RevZilla Item # | MFR. Product # | Availability |
---|---|---|---|
Product Style Carbon Fiber / Slip-On | RevZilla Item #954751 | MFR. Product #005-3860405-S1 | AvailabilityIn Stock: Ships within 24 hours |
This item is also available for 53 different models
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Reviews & Questions
51 Customer Reviews
35 Questions & 22 Answers
5.0 / 5.0
2 Reviews
Bang For The Buck
4.5 / 5
Features
4.0 / 5
Style
5.0 / 5
Ease Of Install
5.0 / 5
Fit & Finish
5.0 / 5
Durability
5.0 / 5
Bang For The Buck
5 / 5
Ease Of Install
5 / 5
Durability
5 / 5
Great slip on
A little louder than I expected however manageable. I ride with a shoei rf-1200 and it helps with the noise. Great exhaust and the sound is great.
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Bang For The Buck
4 / 5
Features
4 / 5
Style
5 / 5
Ease Of Install
5 / 5
Fit & Finish
5 / 5
Durability
5 / 5
Loud love it
Great exhaust sound very loud but has a great sound to it and looks great
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Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 36 questions
Browse 36 questions
and 23 answers
Why did you choose this?
RevZilla Store
I like the look and have had very good results previously with Two Bros. exhaust
Edwardo C
on Sep 12, 2017
I like the look and have had very good results previously with Two Bros. exhaust
Edwardo C
on Sep 12, 2017
What's the difference between S1R and black series ?
is this street legal?
BEST ANSWER: Technically it's not because of smog restrictions in California but I've had it on my bike with no problem sounds great too just make sure you are not revving your engine hight when your next to cops and you should be good
- Reply
- Inaccurate
- Raul C on Aug 22, 2017
- Purchased on May 21, 2017
Is this street legal?
BEST ANSWER: As to the letter of the law NO.... As with most all bike modifications its taking the chance.. They all come with a warning that states for track use only....
- Reply
- Inaccurate
- Jacob L on Aug 24, 2017
How easy it it to install?
BEST ANSWER: Small challenge in removing the heavy Cat, but no need to remove the rear wheel. Just gently pry it while moving the bike slighty forward will do the trick. Rest is straight forward. Great sounding slipon.
- Reply
- Inaccurate
- AHMED OMER AMIN E on Dec 27, 2015
- Purchased on May 13, 2014