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Roadsitalia Exhaust
The Kawasaki Ninja 650 has deeper roots than its name might suggest. Before becoming the Ninja in 2017, it was the ER-6f: a faired mid-displacement sport-tourer that for over a decade won over a vast audience, from newcomers to experienced riders looking for a practical, everyday motorcycle. The name change in 2017 coincided with a genuine renewal — new steel tubular frame, Euro 4 compliance, slipper clutch — but the essence of the project stayed true to what had worked: 649cc parallel-twin, flexible power delivery, contained weight, uncompromising accessibility. From 2021 the engine is updated to Euro 5 homologation, and in 2022 comes the most significant aesthetic and technological leap: full LED headlights, TFT display, two-level traction control. A motorcycle that evolves with restraint, without disrupting the formula. Find all our exhausts in the section dedicated to exhausts for Kawasaki.
In this category we bring together all the full exhaust systems we produce for the Kawasaki Ninja 650, organised by model year. These are systems that replace the entire gas path from the engine outlet to the final muffler, headers included — not slip-ons, not replacement end cans. The original exhaust configuration is the same across all three generations covered — under-engine position with lateral outlet — but the fitting specifications and technical characteristics vary from one year to the next, particularly regarding the number of lambda sensors on the original system. For this reason the systems are divided by year: it is important to select the category corresponding to your model before proceeding with the purchase.
Replacing the entire gas path delivers more complete results than a simple slip-on. The weight reduction compared to the original system is appreciable, with direct effects on the handling and overall lightness of the motorcycle. Power delivery can become more linear and responsive, with a more reactive throttle that better accompanies the character of the parallel-twin. In some configurations the reduction in back pressure can favour freer engine breathing. On the acoustic side the character gains body and presence: more defined, more in keeping with the sporting identity of the Ninja, without artificial transformation.
Every system is produced through handcrafted manufacturing in Lombardy, in the province of Bergamo. Built to order, with internal quality control at every stage. Direct from the manufacturer eliminates all intermediaries and guarantees a direct relationship between those who build the exhaust and those who receive it, with everything that implies in terms of support and product traceability.
As these are full exhaust systems, the original catalysed section is also replaced. The catalytic converter is available as an option on all models and can be selected from the drop-down menu on the product page. Choosing the catalysed version results in no delivery issues or warning lights: a short ECU adaptation period to the new exhaust is normal however, during which small variations in power delivery may appear that will resolve on their own. The Ninja 650 ECU is capable of self-adapting to the new system without external intervention, and on Euro 4 versions this process takes place particularly transparently. Those who choose the non-catalysed version should be aware that the absence of the catalytic section can affect ECU behaviour: power delivery may not be optimal and a remap will likely be necessary to get the best out of the system. The non-catalysed version is reserved for track use or contexts where road compliance is not required, within the limits permitted by local regulations.
The version from 2023 onwards is fitted with a second lambda sensor. Those who choose not to install the catalytic converter should be aware that the MIL warning light will certainly come on: without the catalytic converter the second lambda sensor does not receive the parameters expected by the ECU and generates fault code P0420. To manage this situation the AMC Automatic MIL Clear is available, which handles the MIL warning light without intervening on engine parameters or power delivery. It is available in the section ECUs, OBD II diagnostics and lambda kits.
The dB killer is included as standard on all systems to ensure acoustic compliance. Its removal invalidates the homologation and is not a practice we recommend. For those who want to reduce the sound level further, on some versions the No-Noise configuration is available, with an internally welded filter that lowers the decibels more decisively without significantly affecting the performance of the system. Where available, it is selectable on the product page.
Updated production times are always visible at checkout before confirming the order. The tracking code is sent automatically when the shipment leaves. For any questions about compatibility, differences between variants or technical fitting details, consult the FAQ section or contact us via the Contact page or chat: we respond directly, without intermediaries.
Browse the subcategories below to find the systems available for your model year. The differences between models relate mainly to the shape, material and finish of the muffler. Catalytic converter and No-Noise, where available, are selected directly on the product page. Go to the page of the model you are interested in to see the photos, read the technical specifications and configure your exhaust system.
