Friedrich Boysen GmbH & Co. KG

Turmfeld plant Altensteig

The Boysen Turmfeld plant has been the group's main plant since the early 1970s. The last stage of its expansion in 2011 saw the Boysen vision of a CO2-optimised factory realised at Turmfeld. Electrical power, heating and cooling requirements are largely covered by alternative sources such as solar and geothermal energy.

Start of production

Turmfeld I1972
Turmfeld II1988
Turmfeld III2011

Production area

Turmfeld I7,500 m²
Turmfeld II10,000 m²
Turmfeld III17,000 m²


ServicesJust-in-sequence production of components and complete exhaust systems, production of bent pipes (single and double wall), exhaust trims and exhaust flaps
CustomersAMG, Alpina, Audi, Benteler, Bentley, BMW, Bosch Mahle TurboSystems, Boysen Group, Daimler, Dolmar, Elring Klinger, Isolite, Krauss-Maffay Wegmann, Magna, Mercedes-Benz, Mini, MHG, Mitsubishi Heavy Industries, MAN, MTU, Porsche, Rheinmetall, Rolls-Royce, Seat, VW

Key features

CO2-optimised factory
Exhaust treatment systems for large diesel engines
Fully automated laser machining centre
CNC-controlled bending machines
5-axis laser cutting system
Tailored Tubes welding system
Welding methods: MAG, WIG, laser
Silencer body manufacturing line
2 Canning systems for car catalytic converters, e.g. gasoline particulate filters (GPF)
State of the art automatic measuring cell with packing unit
assembly line for acoustic flaps


Andreas Nölle / Plant Manager
Tel.: +49 (0) 7453 / 20-0
E-mail: friedrich.boysen(at)

Address / Directions

Friedrich Boysen GmbH & Co. KG
Dieselstraße 1
72213 Altensteig