PORSCHE RACING HISTORYSiegfried Brunn (D)
1983 : Thundersports Brands Hatch - 1st overall
4 April 1983 - Thundersports Brands Hatch - Thundersports
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 24 | Porsche 908/03 Turbo | 908/03-011 | Gr.6 | Derek Bell (GB)/Siegfried Brunn (D) | Siggi Brunn Racing (D) | 1st | 1st | 1st | 58 laps |
10 December 1983 - Kyalami 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 936 C | JR-005 | C | Leopold von Bayern (D)/Siegfried Brunn (D)/Klaus Groeger (ZA) | Joest Racing | 7th | 7th | 15th | 217 laps |