Catalysts and Downpipes
HJS 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 20 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.

Our product range


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


HJS’s range of tuning products extends from downpipes with ECE R103 approval to ECE weld-in catalytic converters to universal catalysts.

Universal 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.


Advantages of our ECE downpipes

  • ECE R103 tested
  • 200/300 cpsi stainless steel catalyst
  • Performance optimization
  • Sporty sound
  • Plug & Play
  • Thermal relief of the turbocharger

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