how about some hard numbers?
http://www.natsoft.com.au/cgi-bin/results.cgi?28/09/2003.ARDC.R3Pos Car  Entrant                        Driver                   Vehicle              Cap   CL Laps     Race.Time Fastest...Lap
1     5  AUTOHAUS HAMILTON              Bill Pye (NSW)           Porsche 996 GT3      3600  A     5     8:24.1670   4 1:38.5196R
2    18  TATTERSALL'S                   William Adams (NSW)      Robnell Cobra 302SC  5100  A     5     8:26.9265   4 1:39.2996r
3    43  CELERITY RACING                Stephen Borness (NSW)    Porsche 911 GT3      3598  A     5     8:27.6662   4 1:38.6101r
15   71  BRUGGONE MOTORSPORT            Chris Van Bruggle (NSW)  Lotus Exige          1800  B     5     9:24.1032   5 1:48.5260 
looks like the mustang cobra 302SC finished second with a fastest lap of 1:38, the exige finished 15th , fastest lap of 1:48