Exhaust aftertreatment systems for passenger cars

HJS offers a wide range of OE and retrofit exhaust emissions solutions for cars. And there’s one thing you can most definitely be certain of: all of our products are developed and designed to be a perfect fit, both technically and dimensionally, for each individual vehicle model. We apply the very highest quality standards when testing and manufacturing our products. Every City-Filter®, catalytic converter and assembly kit is tailored specifically to the vehicle in which it is to be installed.

Our customers can rely on perfected solutions that guarantee consistently high quality.

Product Range Online

HJS product range online

This section contains our Online Product Range, the entire range of products we offer for passenger cars, recreational vehicles and light-duty trucks. From HJS's City-Filter®, catalytic converters to assembly equipment – it's all here. Online Product Range ...

Enquiry form Passenger cars, Recreational Vehicle and Light Duty Trucks

Enquiry form for exhaust aftertreatment systems for cars, vans and  recreational vehicles

Our online enquiry form enables you to ask us directly about the availability of a specific retrofit system. Simply fill it in, send it off and we'll get back to you in next to no time. To the enquiry form ...

HJS City-Filter®

Diesel particulate filters: HJS's City-Filter® and SMF® sintered metal filter

Our diesel particulate filters keep the air all of us have to breathe to live clean. They very effectively hold back the soot particles and particulate matter that arise from diesel combustion and "burn them off" continuously. Read more ...

Catalytic Converters

HJS is a leading supplier of catalytic converters
HJS is one the leading suppliers of catalytic converters for spark-ignition and diesel engines. We supply top-quality products and use only the best quality materials, such as stainless steel. Read more ...

Mounting Parts

Assembly equipment – Aftermarket

Any exhaust system is only as good as the weakest joint or fixture that holds it together. This is why the auto trade and repair shops interested in providing quality have been putting their trust in HJS assembly equipment for over 30 years. Read more ...


Higher emissions standard thanks to EURO TR2

By installing an electronic control system designed specifically for spark-ignition engines, a vehicle can be upgraded from Euro 1 to Euro 2. This can save the car owner a considerable amount of money on road tax (Germany specific), while at the same time increasing the resale value of the vehicle. Read more ...

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