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Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
  • Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015 - Stainless Steel
  • Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
  • Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
  • Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
  • Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015

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Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generation RS-4 — a unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.


  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a polyresonant chamber which helps reduce noise
  • Two-stage stepped baffle
  • Turn-out carbon fiber end-cap
  • Stainless steel headers

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


This Product Fits:
Ninja 650R 2012, 2013, 2014, 2015
Ninja 650R ABS 2013, 2014, 2015
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Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015 4.9 5 9 9
Excellent upgrade! This is the best sound to performance ratio for the ex650 I have found, and let me tell you I did 6 months of research before I made my purchase. The silencer was a bit difficult to take out, more so than the Internet made it seem but well worth it. The installation was easy except for one bolt is hidden and very hard to reach with anything but a short socket with a knuckle adapter. So I recommend buying one if you're going to install it yourself. The instructions recommend cleaning the pipes with alcohol before you start it for the first time to stop the fingerprints from messing up the finish...it made a huge nasty swatch of corrosion on the header. I do not recommend you do that, maybe just a good dry microfiber rag instead. Other than that great improvement for the ex650 looks great as well! May 14, 2015
The Perfect Exhaust. It's a beast. The sound is so good and the price is excellent. You don't even need a power commander or juice box for this exhaust. May 7, 2015
Just awesome I'll keep this short and sweet. This is an awesome exhaust in all aspects: sound, looks, performance (according to my butt). Just get it. It gets rid of that motox stock sound of the Ninja 650, and replaces it with a low deep mean growl that definitely grabs the attention of bystanders and motorists. I definitely use it frequently to make my presence known to an inattentive car driver swaying into my path (it's not like there's many of those...........). It sounds amazing without the db killer, but will definitely hurt your ears without earplugs after a while, and neighbors might complain at late hours. The silencer does a good job of lowering the sound level output but at the expense of some meanliness low deep growling, but it also saves your ears (Even if your ears don't hurt at that exact moment, high volume exposure to them will hurt them permanently over time and you can't get it back, so protect your ears at all time). FYI: for those looking for a replacement db killer / 'low volume insert' this is the part you need: http://www.yoshimura-rd.com/prodcat/ins-18-k-insert-kit-low-volume-rs-4-muffler-turn-out-end-cap.asp April 3, 2015
Best I've found for a 2012-2015 Ninja 650 Researched exhaust manufacturers / reviews / listened to a bunch of clips and found that, hands down, this exhaust is the best sounding of the lot in my opinion. Great build quality, very easy to install(Don't even need to remove fairings) and looks amazing. Not sure if I noticed substantial, if any, performance gains. I bought it mainly for the sound/look -The silencer was the first thing to go. So if you're on the fence about which exhaust to go for on the Ninja 650 I highly recommend checking the Yoshi RS-4 out. February 9, 2015
Sounds amazing! This exhaust literally only took me 15 minutes to install! Sounds great. Fits like a glove. July 13, 2014
Great Product, Nice Sound Installed this over the weekend. TIP - Pull up the directions for the Two Brothers exhaust system if you want some better directions on how to remove your old exhaust. I fail at life when it comes to doing my installs so this took more like 3 hours for me lol. The exhaust sounds much deeper and nicer in person ( I kept the DB insert in it.) I am extremely happy with the quality of the part. I used the spacers and all and will keep the DB insert in it for now. My 2013 Ninja 650 ABS does backfire a little bit now but I haven't decided if I will end up committing to getting a power commander or juicebox. We'll see. :) Am very happy with my purchase. May 27, 2014
Great Sound and Looks, No need for Power Commander or Juice Box I bought this exhaust for my 2013 Kawasaki Ninja 650. The sound of stock was docile and I wanted to be heard on the street and be safe, specially from the Car Drivers talking on the phone, while sipping their coffee and making a turn on intersections - or changing lanes :) 1. Even with the quiet insert that comes standard-pre installed, the sound is Loud, I was riding by and a couple of times cops gave me 'I hear you riding by' look in NJ :) ....I'm sure it would be insane louder without the quiet insert. I've heard people driving with mad loud exhausts in NJ anyway... 2. Power commander is not needed and this works fine as stock replacement, unless you are tuning for a particular race track and want to change fuel supply map to a custom map. I got this reply in email from Yoshimura customer service. Alas, I had already bought and installed it by then since they took two weeks to respond :). 3. I got the installation of the full exhaust and power commander V done by the dealer, after buying these from Revzilla. He charged me for 2 hours of labor for installation of both the things and computer tuning for standard map for power commander. Even though the bike only had 1000 miles I changed the gaskets .....what is another 30 bucks while i'm throwing in all my savings on Mods:) 4. Can't comment on durability as I've had this for only 50 miles but Revzilla wouldn't let me leave it alone so I've rated excellent Cheers !!! May 23, 2014
great exhaust purchased this exhaust because i want to be heard. Really easy install about less than a hour to do and what a great sound! April 18, 2014
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Have a functionality, fit, or otherwise product-specific question about the Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
Already Asked: 6 Questions, 15 Answers
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RevZilla Store asked: Why did you choose this?
Abdullah E: Yoshimura is the best, I wanted a loud deep voice for safety and nice intro :). Apr 25, 2015
Tamara T: Best sound and performance for the Ninja 650 IMO and I did lots of research. Very happy with mine. Apr 2, 2015
Parvez S: Best reviews from Kawasaki ninja 650 owners on any site and youtube. Nov 19, 2014
Clay D: annoy everyone....
thing is f-in LOUD dude.
get one NOW!! Take db killer out of pipe
put pipe on bike and drive by cops...
Jul 11, 2014
Jacob E: i wawn make my bikje go vroomvroooooom. Mar 14, 2014
A shopper asked: it says low db insert, is there an actual number on how loud it is? May 1, 2014
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joseph k: I don't have any specific numbers on the db rating. However I purchased this exhaust a few weeks ago and am completely satisfied. The shipping box was excellent it comes shipped with the "low db insert" installed, i would describe it as a mild loud exhaust. Ride it around the block a few times with insert in it. Then removed insert and will never put it back in. Idle is nice and deep if u stand in front of the outlet of muffler it goes through your chest! Revving in neutral sounds a little high pitched for my taste, however under load while driving/ cruising it's a nice deep rich sound. May 1, 2014
Reply to joseph Good answer? Yes (0) No (0)
Brett H: I think "Mildly loud" is perfect. This is definitely loud but not too loud to anger lots of people. It's good and no video will do it justice. May 27, 2014
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Linh N: I don't know the number, but it is significantly louder than the stock exhaust. I was surprised on how loud it was when I installed it. May 1, 2014
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A S asked: Hi,

I have "Kawasaki 2012 Ninja 650".
I'm looking for Exhaust upgrade, most likely Slip-On, because I live in USA, CA.
Main reason is to make it sound better, other advantages are welcome while legal with CA air laws.

Any advice which one I should by for my purpose?

Br, Oleg
Aug 14, 2014
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Linh N: For this exhaust, you'll get a full exhaust system, because the 650R's muffler can't be taken off. I'm not sure if the exhaust system allows for slip-ons after that. Also, this exhaust system requires the removal of the cat. converter, so it may interfere with CA's air laws.

As for sound, it makes it sound incredibly beefy and aggressive, and is also pretty loud (Just turning on my bike and night has caused neighbors to get upset, oops). If you want something with more of a "MotoGP" sound, I'd look at the leo vince.
Aug 14, 2014
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joseph k: CA has tons of restriction laws. I own the Yoshimura and it is very deep and loud. However it does come with the silence pre installed. As long as you don't remove that the police won't bother you and it is a noticeable difference in tone. I have a 2013. And there is no slip on available it is a full exhaust system only. The stock exhaust is on piece on the 2013 model at least not sure about 2012 Aug 14, 2014
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Terrell C asked: Does this system require repacking? Jun 2, 2014
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Ryan R: Every 7,000-10,000 miles.

Search for "Yoshimura RS-4 Muffler Re-Pack Instructions" on Youtube.
Jun 21, 2014
Reply to Ryan Good answer? Yes (1) No (0)
joseph k: Nope simple full exhaust bolt on Jun 2, 2014
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Thomas N asked: Do you have to get your bike tuned after putting this exhaust on? Also do I need to buy anything else for this product to work properly? May 27, 2014
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Brett H: My Ninja 2013 650 ABS does backfire a bit so a juicebox or power commander might be useful but that is really up to you. It is running fine without one for me but I will probably get one in the future. May 27, 2014
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Ryan R: Crush gaskets for your header connections. There was a guy who, upon removing the OEM exhaust, found that the factory never put any on in the first place. Kind of scary. Jun 21, 2014
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Brett H asked: 1. Is this for the racetrack only? Or can you use it for your day to day riding? May 12, 2014
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joshua s: i use this exhaust daily just runs rich but no worries at all overall great exhaust May 12, 2014
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Brett H: Thanks for the quick response. Does it backfire a lot since it runs rich? May 12, 2014
Product Style RevZilla Item # Manufacturer Product # Availability
Stainless Steel / Full System 872184 146500D520 In Stock: Ships within 24 hours