Motorsport & Tuning Products
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HJS Product Portfolio

The HJS product portfolio includes: catalytic converters for motorsport, ECE-approved tuning downpipes and universal catalysts. For the production of customised exhaust systems and repairs, HJS offers a wide range of universal stainless-steel parts. HJS is gladly at your service as an innovative partner for the development, design and production of complex exhaust systems. Our unique experience allied to continuous technological improvement guarantees products of the highest quality and competitiveness.


HJS is Europe's leading manufacturer of motorsport catalysts. Since 1990, HJS has developed and produced catalysts and exhaust systems for motorsport

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HJS’s range of tuning products include downpipes with ECE R103 approval and universal tuning catalysts.

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Universal Competition Exhaust Parts

HJS offers a complete range of universal parts of the highest quality. All products are of high-grade stainless steel and can be used to build customised exhaust systems.

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