Left: Matthias Nonn, born June 9, 1961, high school diploma, German Army, training in his own company, master school, then managing director of Diesel-Nonn GmbH & Co. KG and M.u.S. Nonn GmbH.

Right: Stefan Nonn, born September 3rd, 1963, high school diploma, training in his own company, master school, then managing director of Diesel-Nonn GmbH & Co. KG and managing director of M.u.S. Nonn GmbH

Our Porsche passion began in 1986 and 1988, at which time we purchased our first Porsche vehicles and then modified them more and more. These were the 930 turbo models from the years 1980 and 1985.

The then impressive output of 300 hp was quickly no longer sufficient and extensive renovation work was carried out. The original Porsche performance upgrade with an enlarged turbocharger, an enlarged intercooler, modified intake paths, modified injection valves and a modified four-pipe exhaust system was installed on both vehicles and both engines were also overhauled.

The experience gained during the conversion is of benefit to us today, as we offer corresponding performance improvements for the Turbo 1 generation, see services. After the performance increase, the optimization of the chassis began with modified stabilizers, modified shock absorbers and lowering. Of course, welded Fuchs rims with a rim width of up to 10" were also used on the rear axle.

Then, much to the chagrin of the life partners, the power-to-weight ratio was improved through radical weight reduction, i.e. elimination of air conditioning, insulation material, seats, exhaust, etc. The road racing car was completed with the installation of a roll cage and Recaro racing seats. The Nomex fabric of the seats was unbeatable for comfort, especially at high temperatures. Our “Anton” project today shows the vehicle as our turbos were configured back then.

This time of our first experiences in dealing with these vehicles, which are not entirely uncritical to drive, had a decisive influence on us and is the reason for our great love for the original vehicles without electronic helpers. We were taught how to control the turbos at their limits through safety training courses at the time (now track days) in many ways by experienced instructors. Not to be forgotten are the instructors from the Porsche Sport Driving School and especially our friend Olaf Lang, who supported and taught us significantly and will always be remembered by us.

Contact us now





Im Wehrengrund 2
34560 Fritzlar

Opening hours

Monday – Friday: 08:00 – 17:00 Uhr
Samstag by appointment


+49 5622 7981492


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How to find us

Unfortunately, our street is not yet shown on most maps. With the following description and sketch you should be able to find us easily.

  • A49 take exit 14 “Fritzlar”
  • (coming from the south: turn left onto L3150 towards Fritzlar)
  • Follow the right lane towards B450/Fritzlar/Edersee
  • Turn right onto L3214
  • At the traffic lights turn right onto B450
  • Immediately afterwards turn right again onto “Brautäcker”
  • And last but not least, turn left again
  • You are now “in the Wehrengrund” and will find us on the right-hand side

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