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| www.QV500.com - Porsche 911 3.0 RSR 'Prototyp' - 1973 Trans Am Championship |
| Rd. | Race | Drivers | Team | Chassis | Result |
| 1 | Road Atlanta | Holbert | Holbert Porsche + Audi | R3 | 2nd |
| 2 | Lime Rock | Holbert | Holbert Porsche + Audi | R3 | 3rd |
| 3 | Watkins Glen | Donohue/Holbert | Holbert Porsche + Audi | R3 | 8th |
| 4 | Sanair | Holbert | Holbert Porsche + Audi | R3 | 4th |
| 5 | Elkhart Lake | Holbert | Holbert Porsche + Audi | R3 | 3rd |
| 6 | Edmonton | Holbert/Mintner | Holbert Porsche + Audi | R3 | 4th |