PORSCHE RACING HISTORYPeter Gregg (USA)
1973 : Daytona 24 Hours - 1st overall : Sebring 12 Hours - 1st overall : Le Mans 24 Hours - 3rd in class
4 February 1973 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 911 Carrera RSR | 911 360 0328 R4 | S3.0 | Peter Gregg (USA)/Hurley Haywood (USA) | Brumos Porsche (USA) | 1st | 1st | 8th | 670 laps |
24 March 1973 - Sebring 12 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 911 Carrera RSR | 911 360 0705 | GTO | Peter Gregg (USA)/Hurley Haywood (USA)/Dave Helmick (USA) | Dr. Dave Helmick (USA) | 1st | 1st | 4th | 226 laps |
10 June 1973 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 48 | Porsche 911 Carrera RSR | 911 360 0020 R2 | GT3.0 | Peter Gregg (USA)/Guy Chasseuil (F) | Porsche Sonauto BP Racing (F) | 14th | 3rd | 36th | 299 laps |
21 July 1973 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 911 Carrera RSR | 911 360 0686 R7 | S3.0 | Peter Gregg (USA)/Hurley Haywood (USA) | Brumos Porsche-Audi Corp. (USA) | 7th | 7th | 11th | 168 laps |
22 July 1973 - Can-Am Watkins Glen - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 58 | Porsche 911 Carrera RSR | 911 360 0686 R7 | Peter Gregg (USA) | Brumos Racing | 9th | 19th | 53 laps |