PORSCHE RACING HISTORYGünther Klass (D)
1964 : Targa Florio - 3rd in class : Nürburgring 1000 km - 3rd in class
26 April 1964 - Targa Florio - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 74 | Porsche 356B Carrera 2000 GS/GT | 356-122 991 | GT2.0 | Günther Klass (D)/Jochen Neerpasch (D) | Porsche System Engineering (D) | 7th | 3rd | 10 laps |
31 May 1964 - Nürburgring 1000 km - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 36 | Porsche 356B Carrera 2000 GS/GT | 356-122 991 | GT1.6 | Günther Klass (D)/Sepp Greger (D) | Günther Klass (D) | 15th | 3rd | 29th | 41 laps |