Kawasaki ZR900 Performance 17 – 2021′ Exhaust Pipe & Black Alloy Shield Cover

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When it comes to upgrading your motorcycle’s performance and sound, few modifications deliver as much impact as investing in high-quality kawasaki performance superbike exhausts, and this premium de-cat pipe system for the Kawasaki ZR900 Performance (2017-2021) represents exceptional value for riders seeking measurable gains in power, weight reduction, and throttle response.

Premium Kawasaki Performance Superbike Exhausts: What’s Included

This comprehensive exhaust upgrade package has been specifically engineered for the Kawasaki ZR900 Performance models manufactured between 2017 and 2021. When you order this system, you’ll receive a precision CNC mandrel-bent 2-inch de-cat link pipe, complete with all necessary mounting brackets, a high-quality stainless steel clamp, and a stylish black alloy heat shield cover at an incredible 50% discount when purchased with the pipe.

The de-cat pipe itself is manufactured using advanced CNC mandrel bending technology, which ensures consistent internal diameter throughout the bend radius. This manufacturing process is critical for maintaining smooth exhaust gas flow, eliminating turbulence, and maximising the performance characteristics that enthusiasts expect from premium kawasaki performance superbike exhausts.

Installation and Fitment Details

Installation of this de-cat system requires modification to your standard exhaust headers. Specifically, you’ll need to cut the factory headers at the measurements indicated in the product images. Don’t let this put you off—the process is straightforward for anyone with basic mechanical skills and the right tools, or can be completed quickly by your local motorcycle workshop.

The beauty of this system lies in its simplicity: once the restrictive catalytic converter box has been removed and the headers cut to size, the new de-cat pipe slots into position and secures with the included premium-grade clamp. There’s absolutely no welding required, making this a reversible modification should you ever need to return the bike to stock configuration. Importantly, the system maintains the position of your exhaust O2 sensor in the front downpipes, ensuring your bike’s fueling system continues to receive accurate data.

Your rear silencer—whether standard or aftermarket—will fit exactly as it did before. The only difference is the absence of that bulky, heavy, and highly restrictive catalytic converter box that robs your ZR900 of performance and character.

Weight Savings That Make a Difference

One of the most immediately noticeable benefits when fitting kawasaki performance superbike exhausts is the dramatic reduction in weight. The factory catalytic converter box on the ZR900 Performance tips the scales at a hefty 4.33 kilograms. In stark contrast, this aftermarket de-cat pipe weighs just 0.7 kilograms, delivering an impressive weight saving of 3.6 kilograms from this single component change.

Removing nearly four kilograms of weight from the exhaust system—positioned relatively high and centrally on the motorcycle—has tangible benefits for handling, acceleration, and overall rider experience. The bike will feel noticeably more responsive, change direction more eagerly, and accelerate more freely throughout the rev range.

Performance Benefits of Quality Kawasaki Performance Superbike Exhausts

The restrictive nature of catalytic converters is well documented among motorcycle enthusiasts and performance tuners. Whilst these components serve an important environmental function, they create significant backpressure that limits engine breathing and restricts power output, particularly at higher RPM ranges where performance motorcycles do their best work.

By removing this restriction, you’ll unlock hidden horsepower and torque that Kawasaki engineers built into the ZR900’s capable powerplant. Throttle response becomes crisper, acceleration more urgent, and the engine note transforms into a deeper, more purposeful sound that reflects the bike’s true performance character.

Our exhausts are meticulously manufactured to deliver maximum power gains without requiring changes to your fuel mapping under standard conditions. However, if you’re running an aftermarket air filter and have now fitted this de-cat pipe, we strongly recommend having your motorcycle’s fueling professionally optimised. A custom ECU map or Power Commander tune will allow you to extract every last horsepower whilst ensuring the engine runs safely and efficiently across all operating conditions. For comprehensive information on motorcycle exhaust systems and their impact on performance, Motorcycle News provides excellent technical resources and buyer guides.

Legal Considerations and MOT Compliance

An important consideration for UK riders is MOT compliance. Current MOT testing regulations for motorcycles focus on noise emissions rather than exhaust gas emissions. This means that if you retain a road-legal silencer—whether standard or an aftermarket unit marked with BSAU approval—your motorcycle will remain MOT compliant even with the catalytic converter removed.

All our road-legal exhausts feature a removable road-legal baffle (often called a decibel killer) and carry the appropriate BSAU (British Standard Automotive) markings that demonstrate compliance with UK road traffic regulations. With the baffle installed, your exhaust meets legal noise requirements. Once you remove the baffle, the exhaust is classified as a race exhaust and is no longer road legal—perfect for track days and competition use.

Our race exhausts, by contrast, do not include removable baffles and do not carry BSAU markings, as they’re designed exclusively for closed-course competition use.

Complementary Upgrades

If you’re upgrading your ZR900 Performance, you might also be interested in our range of complementary products for other Kawasaki models. The Kawasaki ZR900RS Cafe 2022′ Stainless De-cat exhaust pipe offers similar performance benefits for the café racer variant, whilst our extensive catalogue covers everything from header pipes to complete exhaust systems.

Frequently Asked Questions

Will I need to remap my ECU after fitting this de-cat pipe?
For standard bikes with factory air filters, remapping isn’t strictly necessary—the exhaust is designed to work with stock fueling. However, if you’ve also fitted an aftermarket air filter or plan to do so, professional ECU optimisation is highly recommended to maximise performance and ensure safe engine operation.

Is the installation reversible?
Whilst the de-cat pipe itself requires no welding and can be removed easily, the installation does require cutting your standard exhaust headers. If you wish to return the bike to completely stock configuration, you would need to source replacement standard headers.

Will this fit aftermarket rear silencers?
Yes, absolutely. Any rear silencer that fitted your ZR900 Performance before will fit exactly the same way after installing this de-cat pipe. The connection point diameter and positioning remain identical to the factory setup.

What tools will I need for installation?
You’ll need basic hand tools including spanners and sockets, plus an angle grinder or pipe cutter to remove the standard catalytic converter box at the specified measurements. The entire installation can typically be completed in under two hours.

Transform your Kawasaki ZR900 Performance with this exceptional de-cat pipe system and experience the true character of your machine. With dramatic weight savings, liberated performance, and enhanced sound, this upgrade delivers outstanding value for discerning riders who demand the very best from their motorcycles.

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