Cover Your Ears, SC-Project Just Dropped Exhaust Systems For The Kawasaki Z900

SC-Project has a bunch of new exhaust systems specifically designed for the Kawasaki Z900. Take your pick from the race-inspired CR-T to the subtle and classy SC1-R.

Photo by: SC-Project

By: Enrico Punsalang

Aug 14, 2025 at 9:18am ET

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For a lot of riders, the first real upgrade they make to their bike isn’t fancy suspension or a big-bore kit—it’s an aftermarket exhaust. And it’s easy to see why. For casual riders, a slip-on or full system instantly adds visual flair and gives the bike a soundtrack that turns heads. For serious riders, the right exhaust can free up horsepower, shed kilos, and fine-tune the bike’s character.

The Kawasaki Z900 fits perfectly into that mindset. It’s one of those do-it-all nakeds that’s just as happy commuting through the city as it is tearing up back roads or doing a track day. That versatility means riders from all walks of life can enjoy it, and SC-Project has built an entire lineup of exhausts to suit just about every taste and performance goal. Let’s take a look at what the Italian company has for riders who bleed green.

Kawasaki Z900 - SC-Project S1

Photos by: SC-Project

Kawasaki Z900 - SC-Project CR-T

The S1 is a prime example of “form meets function.” With a tapered titanium body, matte carbon end cap, and welded titanium piping, it shaves 6.28 pounds off the stock system while adding 3.5 horsepower and 2.06 pound-feet. Available in natural titanium or matte black, it keeps the bike looking lean while delivering a sharp, engaging tone from the Z900’s inline-four.

If you want something short, loud, and unapologetically race-inspired, the CR-T is hard to ignore. It’s a multiple MotoGP and Moto2 title winner in design terms, with titanium or carbon body options, CNC-machined bushings, and that distinctive flame-breaking mesh. Gains are a healthy 3.9 horsepower and 3.39 lb-ft, with 7.28 pounds saved. It’s a compact can that screams “track day” even if you never leave the street. Take note, though, this is one of the loudest aftermarket systems from SC-Project, so if you want your bike to growl at idle and scream at the top end, this one’s definitely for you.

Kawasaki Z900 - SC-Project SC1-R

Photo by: SC-Project

My personal favorite is the SC1-R. It’s arguably the classiest of the bunch, with a shape that feels closest to OEM while still flexing SC-Project’s signature design. Hydroformed titanium, autoclave carbon accents, and a carbon heat shield give it just the right amount of bling. Performance jumps by 5.2 horsepower and 3.17 lb-ft, and it drops the weight down to just 4.19 pounds. Plus, thanks to its large body, it’s not overly loud. It’s just enough to make the bike sound alive without being obnoxious.

Kawasaki Z900 - SC-Project 4-2-1 Exhaust

Photo by: SC-Project

For those who want it all, the 4-2-1 full system is where things get serious. Built in titanium or stainless steel, it’s compatible with all Z900 slip-ons and is designed to ditch the catalytic converter for maximum flow (and even more loudness). That means an 8.8 horsepower and 5.23 lb-ft boost, plus 9.48 pounds of weight savings, along with a louder, raspier exhaust note. Just remember, ditching the catalytic converter may not be legal depending on where you’re riding. So be sure to check your local laws before pulling the trigger on this one.

Kawasaki Z900 - SC-Project GP M2

Photo by: SC-Project

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Finally, the GP-M2 is a piece of SC-Project history. Originally designed for Moto2 racing, it brings a compact carbon body, stainless end cap, and bracket mounting. Gains are 3.8 horsepower and 2.43 lb-ft at 8,200 rpm, and weight plummets from 9.04 pounds stock to just 3.53 pounds. It’s Euro 5 compliant but still delivers that aggressive, unmistakable Z-series roar.

So whether you want subtle style, full-on track aggression, or something in between, SC-Project’s Z900 lineup has you covered. And no matter which you choose, you’ll end up with more power, less weight, and a soundtrack that’s sure to get you giddy every time you twist that throttle.