Yoshimura RS4 Race Exhaust System Kawasaki Ninja 650R 2012-2015
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
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:
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
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
May 23, 2014
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