Spiess Tuning

Spiess Tuning is the common identity of Siegfried Spiess Motorenbau GmbH, a motor vehicle engine tuning company based in Ditzingen, Baden-Württemberg, Germany . Today Spiess Tuning is most famous for its Formula 3 motor racing engines based on the Opel Family II and two iterations of Volkswagen R4 engines.[1]

In addition, Spiess has worked on many different engines with motor racing applications, including a 4.0 litre V8 for use in the DTM Opel Vectra.[2]

## References

1. ↑ "Comeback in Formula 3". Spiess Tuning. http://www.spiess-tuning.com/en/projekt_f3_vw_2008_en.php. Retrieved 2010-05-22.
2. ↑ "DTM". Spiess Tuning. http://www.spiess-tuning.com/en/projekt_dtm_en.php. Retrieved 2010-05-22.

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