Motorcycle catalytic converters for emissions and compliance

Motorcycle catalytic converters are essential components of the exhaust system, designed to reduce harmful emissions and ensure compliance with European environmental regulations. Integrated into motorcycle silencers or full exhaust systems, they play a key role in meeting standards such as Euro 3, Euro 4, Euro 5 and Euro 5+.

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		LeoVince catalytic converter 40 mm Catalyst 40 mm Code: 8605K Leovince offers a wide range of accessories for your motorcycle. Quality of materials, design and workmanship are distinctive features of each component produced. Code: 8605K	157,38€ 118,04€ Add to cart
		MIVV Catalyst approved ACC.046.A1 The MIVV ACC.046.A1 homologated catalytic converter is engineered to ensure the best compromise between engine performance and emission compliance. Its metal honeycomb structure incorporates noble... Code: ACC.046.A1	317,20€ 244,24€ Add to cart
		Akrapovic homologated catalyst converter for exhausts specify for Honda CB650F/CBR650F 2014>2016 Akrapovic homologated catalyst APPROVED EURO 3 Akrapovic proposes a performance-oriented catalytic converter that will give you all the improvements in sound and performance to which an Akrapovic... Code: P-KAT-040	201,30€ 165,07€ Add to cart
		MIVV Catalyst approved ACC.045.A1 The MIVV ACC.045.A1 homologated catalytic converter is engineered to ensure the best compromise between engine performance and emission compliance. Its metal honeycomb structure incorporates noble... Code: ACC.045.A1	280,60€ 216,06€ Add to cart
		MIVV Catalyst approved ACC.033.A1 The MIVV ACC.033.A1 homologated catalytic converter is engineered to ensure the best compromise between engine performance and emission compliance. Its metal honeycomb structure incorporates noble... Code: ACC.033.A1	183,00€ 140,91€ Add to cart
		Termignoni link pipe no catalyst in inox for Ducati Panigale 959 2016> Termignoni link pipe decatalico for Ducati Panigale 959 D16909430IXX Il link pipe è composto da una struttura in acciaio In terms of performance, the silencers with the Termignoni De-cat offer:... Code: D16909430IXX	608,78€ 487,02€ Add to cart
		MIVV Catalyst approved ACC.077.A1 The MIVV ACC.077.A1 homologated catalytic converter is engineered to ensure the best compromise between engine performance and emission compliance. Its metal honeycomb structure incorporates noble... Code: ACC.077.A1	In stock 256,20€ 197,27€ Add to cart
		Termignoni catalyst homologated for Yamaha MT09/XSR900 2014> Termignoni catalyst for Yamaha MT09/XSR900 Y102CAT The catalyst is composed of a metallic honeycomb structure that incorporates precious metals (palladium, rhodium and platinum) on its... Code: Y102CAT	512,40€ 409,92€ Add to cart
		Akrapovic catalyst converter for Akrapovic exhausts specify for Yamaha MT09/FZ09 2017> Akrapovic homologated catalyst APPROVED EURO 4 Akrapovic proposes a performance-oriented catalytic converter that will give you all the improvements in sound and performance to which an Akrapovic... Code: P-KAT-057	378,20€ 310,12€ Add to cart
		MIVV Catalyst approved ACC.033.A2 The MIVV ACC.033.A2 homologated catalytic converter is engineered to ensure the best compromise between engine performance and emission compliance. Its metal honeycomb structure incorporates noble... Code: ACC.033.A2	366,00€ 281,82€ Add to cart

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From a technical perspective, a motorcycle catalytic converter is a chemical device that uses catalytic materials such as platinum, palladium and rhodium to trigger oxidation and reduction reactions. These processes convert harmful gases produced during combustion—such as carbon monoxide and unburned hydrocarbons—into less harmful substances, reducing emissions while maintaining overall engine performance.

What is the purpose of a motorcycle catalytic converter?

The motorcycle catalytic converter reduces the environmental impact of the bike by lowering pollutant emissions and ensuring compliance with legal standards. It is a crucial component for road use and for passing mandatory vehicle inspections.

Beyond its environmental role, the catalytic converter also influences exhaust gas management, working together with headers and the silencer to maintain a balance between emissions, noise levels and performance.

What happens if you remove the catalytic converter?

Removing the motorcycle catalytic converter—a process known as decat—reduces exhaust restrictions, which may result in improved performance and a louder, more aggressive sound. However, this modification makes the motorcycle non-compliant with emission regulations, exposing the rider to fines, failed inspections and potential legal issues.

Additionally, removing the catalytic converter can affect engine operation if not supported by proper modifications, such as adjusting the motorcycle ECU, upgrading engine mapping or modifying the intake system with air filters and airboxes.

When is a catalytic converter homologated?

A motorcycle catalytic converter is homologated when it complies with European emission standards (such as Euro 5) and is specifically designed for a particular motorcycle model. Homologated systems are tested to ensure emission levels meet legal requirements, allowing safe and legal road use.

In the aftermarket world, decat pipes are also available. These components replace the original catalytic converter inside the exhaust system and are intended for racing use only, as they are not road-legal.

Types of motorcycle catalytic converters

Motorcycle catalytic converters are available in various configurations and diameters to ensure compatibility with different bikes and exhaust systems. Leading brands such as Akrapovic, Arrow, MIVV, Remus and Malossi offer model-specific solutions for both motorcycles and scooters, including popular models like Aprilia Tuono 660, Yamaha TMAX 560 and Vespa.

A common example is the Arrow catalytic converter, designed for installation on compatible exhaust systems, ensuring emission compliance and seamless integration.

Maintenance and efficiency

Maintaining the efficiency of the motorcycle catalytic converter is essential for proper exhaust system performance. A damaged or worn catalytic converter can negatively affect both emissions and engine efficiency.

Within this category, you will find:

Homologated motorcycle catalytic converters
Catalytic converters for aftermarket exhaust systems
Components compatible with slip-on and full exhaust systems
Solutions for motorcycles and scooters

Choosing the right motorcycle catalytic converter ensures reduced emissions, compliance with regulations and optimal exhaust performance, maintaining the correct balance between performance and environmental sustainability.