Also note that as others have said it is not just your kind of car that u are tryiing to insure but also..

Where you live
Past driving habbits
Prev "AT FAULT" accidents
The type of car you drive (ie a commodore and an ss commie dore are classified as different cars even though they are both large family cars)
Is it a 2 or 4 door
Turbo or Non Turbo
Is the driver Male and in the 16-25 percentile
Mag Wheels
Is stereo stock or aftermarket
Previous traffic infringements
Does it have factory or Aftermarket Immobilizer /alarm

Just to name a few.