GP Series Slip-On Exhaust (GP 19 Black) for 13-19 Kawasaki ZX636

Sound great on my 2025 zx6r

This m4 was shipped super fast got it in 3 days. The install was super simple they give you hardware n the new bracket n nuts also came with directions an decals. It took me 10 min to install. Great quality looks great i am super super super happy with it. I had a ttwo brothers exhaust this is much better . Sounds great . I would highly recommend this. This is not a cheap knock off... i am happy n will highly recommend this product to my friends. This pipe connects to your cat.. install is 2 out of 10 on being hard to install. Dont need a mechanic. . This product is an A+++++++++++. This fit my 2014 Kawasaki ninja zx6r 636.

Like the title says - this exhaust is loud. It entails removing the stock muffler and the muffler box. Essentially leaving the headers + cat + this exhaust. The grumble is low and raw at idle. The revs are raw when picking up speed. At redline, this thing sounds like a jet. I’d recommend wearing earplugs if you don’t already do so. KEEP IN MIND - Removinf the exhaust and muffler box may be difficult if you’re doing this on an older bike (ie my Bike is 2019 but I did this in 2022). The different sections and bolts in the exhaust and muffler were stuck, so I had to basically tear up the thing to get it removed. If you’re doing this in a brand brand new Motorcyle, everything should slip right off. Install is super easy

Great sound and easy installation

This thing sounds amazing. I would say this is arguably the best sounding exhaust for my 2024 zx6r. Easy installation.

I was kinda skeptical placing this order with no reviews, but at the same time saw that it was the only official photo of the actual GP-19 in production right now by M4. If you notice the rest of the GP-19's are just a circle tip end on the muffler when it should actually have the protruding circle tip. So i made the purchase and waited on my fate. Open the box it is as shown people! This slip on requires removing the stock muffler, muffler/exhaust box and servo unit located underneath the drivers seat. Also keep in mind to order the Servo Buddy to get rid of you Check Engine Light otherwise you’ll have that on after installing and first start up. After adding the Servo Buddy it will go away. There are 2 Models of the GP series muffler be aware The new series in production by M4 is the GP19, the GP is the older brother with non-protruding tip.

There are enough videos online to help if you are stuck but it's a pretty easy install and looks and sounds amazing. Make sure to get a servo buddy.

As advertised: new in box M4 GP exhaust. Installed on 2019 Ninja 636 in less than 30 minutes - do not forget your servo buddy unless you want a permanent "check engine" light. This thing is LOUD... Obnoxiously loud. Like: group-rides-will-stick-you-in-the-back-of-the-pack level of LOUD (but you wont use it on the street anyway, right?) I love it