The 2003 Australian Nations Cup Championship was a CAMS sanctioned motor racing title [1] for drivers of GT sports cars [2] complying with Group 2E Nations Cup regulations. [3] The championship, which was managed by Procar Australia as part of the 2003 Procar Championship Series, [4] was the fourth Australian Nations Cup Championship. [5] The title was won by Paul Stokell driving a Lamborghini Diablo GTR.
The championship was contested over an eight-round series [6] with three races per round. [7]
Note: ** Race 3 at the Surfers Paradise round was cancelled due to a security issue. [23]
Championship points were awarded on a 30-20-16-13-11-10-9-8-7-6-5-4-3-2-1 basis to the first 15 finishers in each race. [4] In addition, three points were awarded to the driver earning pole position. [4]
| Position [25] [26] | Driver [25] [26] | No. [7] | Car [7] | Entrant [7] | Points [25] [26] |
|---|---|---|---|---|---|
| 1 | Paul Stokell | 27 | Lamborghini Diablo GTR | Crazy John's | 539 |
| 2 | John Bowe | 888 | Ferrari 360 N-GT Chrysler Viper ACR Porsche 911 GT3 RS | Verve 501 | 493 |
| 3 | Nathan Pretty | 427 | Holden Monaro 427C | Garry Rogers Motorsport | 374 |
| 4 | Peter Brock | 05 | Holden Monaro 427C | Garry Rogers Motorsport | 265 |
| 5 | James Koundouris | 33 99 | Porsche 911 GT3 Clubsport Ferrari 360 Modena Challenge | Supabarn Emporium Mark Coffey Racing | 156 |
| 6 | Greg Crick | 2 | Chrysler Viper ACR | Geoff Morgan | 148 |
| 7 | Sam Newman | 17 | Lamborghini Diablo GTR Lamborghini Diablo SVR | Crazy John's | 144 |
| 8 | Allan Simonsen | 88 | Ferrari 360 Modena Challenge | Mark Coffey Racing | 129 |
| 9 | Martin Wagg | 67 | Porsche 911 GT3 RS | JMC Group | 127 |
| 10 | Anthony Tratt | 75 | Lamborghini Diablo GTR | Toll / IPEC | 92 |
| 11 | Gary Young | 8 | Maserati Trofeo Porsche 911 GT3 Clubsport | Trident Racing Martin Wagg | 61 |
| 12 | Mark Eddy | 30 | Porsche 911 GT3 | Hot Sand Surfwear | 51 |
| 13 | Paul Blackie | 24 | Porsche 911 GT3 Clubsport | Pro-Floor | 49 |
| 14 | Rod Wilson | 28 11 | Maserati Trofeo Ford Mustang Cobra R | Trident Racing & Pirelli | 41 |
| 15 | Jim Richards | 1 | Porsche 911 GT3 | OAMPS Insurance | 40 |
| 16 | John Teulan | 54 | Ferrari 360 Modena Challenge | Industrie Central | 36 |
| 17 | D'arcy Russell | 7 | Chrysler Viper ACR | D'arcy Russell Racing | 35 |
| 18 | Wayne Hennig | 55 | Porsche 911 GT3 Clubsport | Wayne Hennig | 34 |
| VJ Angelo | 4 | BMW Z3 GT | VJ Angelo | 34 | |
| 20 | Peter Hackett | 37 | Lamborghini Diablo GTR | Cactus | 32 |
| 21 | Simon Bartter | 70 | Porsche 911 GT3 Clubsport | Red Rooster | 31 |
| 22 | Tony Quinn | 32 | Porsche 911 GT3 Carrera | VIP Petfoods | 28 |
| 23 | Rusty French | 6 | Porsche 911 GT3 | Skye Sands | 26 |
| 24 | David Stevens | 66 | Porsche 911 GT3 Clubsport | Securetel | 25 |
| 25 | Jonathon Webb | 22 | Porsche 911 GT3 Carrera | Tekno Autosports | 23 |
| 26 | Neil Bryson | 25 | Porsche 911 GT3 Clubsport | CGA Bryson | 22 |
| 27 | Wayne Park | 58 | Porsche 911 GT3 Clubsport | Property Solutions Group | 20 |
| 28 | Kevin Miller | 58 | Porsche 911 GT3 Clubsport | Property Solutions Group | 17 |
| 29 | Dean Koutsoumidis | 71 | Porsche 911 GT3 Clubsport | Equity-one Finance & Investments | 16 |
| 30 | Murray Carter | 18 | Chevrolet Corvette C5 | Murray Carter | 15 |
| 31 | Klaus Engelhorn | 48 | Ferrari 360 N-GT | BE Racing | 14 |
| 32 | Stuart Kostera | 48 | Porsche 911 GT3 Clubsport | Dunlop Super Dealers | 13 |
| Theo Koundouris | 33 | Porsche 911 GT3 Clubsport | Supabarn Emporium | 13 | |
| 34 | Kim Burke | 68 | Porsche 911 GT3 Clubsport | JK Burke | 12 |
| 35 | David Lawson | 28 | Maserati Trofeo | Trident Racing | 11 |
| 36 | Andrew Miedecke | 36 | Porsche 911 GT3 Cup | Whiteline Transport | 8 |
| 37 | Andrew Taplin | 16 | Porsche 911 GT3 | Andrew Taplin | 7 |
| 38 | Maher Algadri | 70 | Porsche 911 GT3 Clubsport | Verve 501 | 6 |
| 39 | Russell Wright | 50 | Porsche 911 GT3 Clubsport | Kingfisher Luxury Boats | 1 |
| Group 1 | |||||
| 1 | Paul Stokell | 27 | Lamborghini Diablo GTR | Crazy John's | 540 |
| 2 | John Bowe | 888 | Ferrari 360 N-GT Chrysler Viper ACR Porsche 911 GT3 RS | Verve 501 | 494 |
| 3 | Nathan Pretty | 427 | Holden Monaro 427C | Garry Rogers Motorsport | 375 |
| 4 | Peter Brock | 05 | Holden Monaro 427C | Garry Rogers Motorsport | 265 |
| 5 | Greg Crick | 2 | Chrysler Viper ACR | Geoff Morgan | 148 |
| 6 | Martin Wagg | 67 | Porsche 911 GT3 RS | JMC Group | 140 |
| 7 | Anthony Tratt | 75 | Lamborghini Diablo GTR | Toll / IPEC | 95 |
| 8 | Mark Eddy | 30 | Porsche 911 GT3 | Hot Sand Surfwear | 77 |
| 9 | Sam Newman | 17 | Lamborghini Diablo GTR | Crazy John's | 60 |
| 10 | Jim Richards | 1 | Porsche 911 GT3 | OAMPS Insurance | 40 |
| 11 | D'arcy Russell | 7 | Chrysler Viper ACR | D'arcy Russell Racing | 38 |
| 12 | Peter Hackett | 37 | Lamborghini Diablo GTR | Cactus | 32 |
| 13 | Klaus Engelhorn | 48 | Ferrari 360 N-GT | BE Racing | 19 |
| Group 2 | |||||
| 1 | James Koundouris | 33 99 | Porsche 911 GT3 Clubsport Ferrari 360 Modena Challenge | Supabarn Emporium Mark Coffey Racing | 410 |
| 2 | Allan Simonsen | 88 | Ferrari 360 Modena Challenge | Mark Coffey Racing | 342 |
| 3 | Sam Newman | 17 | Lamborghini Diablo SVR | Crazy John's | 218 |
| 4 | Gary Young | 8 | Maserati Trofeo Porsche 911 GT3 Clubsport | Trident Racing Martin Wagg | 130 |
| 5 | Paul Blackie | 24 | Porsche 911 GT3 Clubsport | Pro-Floor | 101 |
| 6 | Rod Wilson | 28 11 | Maserati Trofeo Ford Mustang Cobra R | Trident Racing Pirelli | 96 |
| 7 | VJ Angelo | 4 | BMW Z3 GT | VJ Angelo | 94 |
| 8 | Tony Quinn | 32 | Porsche 911 GT3 Carrera | VIP Petfoods | 93 |
| 9 | Rusty French | 6 | Porsche 911 GT3 | Skye Sands | 83 |
| 10 | John Teulan | 54 | Ferrari 360 Modena Challenge | Industrie Central | 75 |
| Wayne Hennig | 55 | Porsche 911 GT3 Clubsport | Wayne Hennig | 75 | |
| 12 | Simon Bartter | 70 | Porsche 911 GT3 Clubsport | Red Rooster | 71 |
| 13 | Neil Bryson | 25 | Porsche 911 GT3 Clubsport | CGA Bryson | 57 |
| 14 | David Stevens | 66 | Porsche 911 GT3 Clubsport | Securetel | 56 |
| 15 | Dean Koutsoumidis | 71 | Porsche 911 GT3 Clubsport | Equity-one Finance & Investments | 53 |
| 16 | Jonathon Webb | 22 | Porsche 911 GT3 Carrera | Tekno Autosports | 52 |
| 17 | Kevin Miller | 58 | Porsche 911 GT3 Clubsport | Property Solutions Group | 48 |
| 18 | Murray Carter | 18 | Chevrolet Corvette C5 | Murray Carter | 41 |
| 19 | Wayne Park | 58 | Porsche 911 GT3 Clubsport | Property Solutions Group | 36 |
| 20 | Kim Burke | 68 | Porsche 911 GT3 Clubsport | JK Burke | 32 |
| 21 | David Lawson | 28 | Maserati Trofeo | Trident Racing | 30 |
| 22 | Stuart Kostera | 48 | Porsche 911 GT3 Clubsport | Dunlop Super Dealers | 29 |
| Theo Koundouris | 33 | Porsche 911 GT3 Clubsport | Supabarn Emporium | 29 | |
| 24 | Andrew Miedecke | 36 | Porsche 911 GT3 Cup | Whiteline Transport | 20 |
| 25 | Maher Algadri | 70 | Porsche 911 GT3 Clubsport | Verve 501 | 18 |
| 26 | Andrew Taplin | 16 | Porsche 911 GT3 | Andrew Taplin | 16 |
| 27 | Russell Wright | 50 | Porsche 911 GT3 Clubsport | Kingfisher Luxury Boats | 6 |
The Manufacturers Trophy was awarded to the manufacturer which attained the highest number of cumulative points over all rounds, inclusive of pole position points. [4] Points were awarded as per the drivers championship to the two highest scoring finishers from each marque in each race. [4]
| Position [27] | Manufacturer [27] | Car(s) | Points [27] |
| 1 |  Porsche | 911 GT3 911 GT3 RS 911 GT3 Cup 911 GT3 Carrera 911 GT3 Clubsport | 1,221 |
| 2 |  Lamborghini | Diablo GTR Diablo SVR | 945 |
| 3 | Ferrari | 360 N-GT 360 Modena Challenge | 901 |
| 4 |  Holden | Monaro 427C | 639 |
| 5 |  Chrysler | Viper ACR | 248 |
| 6 | Maserati | Trofeo | 201 |
| 7 | BMW | Z3 GT | 94 |
| 8 | Chevrolet | Corvette C5 | 41 |
| 9 | Ford | Mustang Cobra R | 25 |
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