Catalysts and exhaust systems for Motorsport and Tuning

We have been engaged since 1990 in the development and production of HJS catalysts and exhaust systems for motorsport. Based on the experience it has accumulated in motorsport, HJS has for over 10 years now also produced tuning catalysts for road-going vehicles.


Our customers – from amateur sportspeople to works teams and hobby tuners to vehicle manufacturers – know us as an efficient, service-oriented company. Innovative technologies and products, customer satisfaction and long-lasting business relations are the basis for our future. At the same time, we make an important contribution to the protection of both humans and the environment.


HJS tuning catalysts with 200 cpsi have been developed on the basis of our motorsport catalysts. The product range extends from downpipes with ECE R103 approval to ECE catalytic converters to universal catalysts.

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