It is not a Pontiac - it is a LH drive Holden Commodore, built in South Australia by
General Motors Holden, based on the Commodore VE II platform which is designed in OZ.
This vehicle is also exported to the Middle East badged as Chev Lumina.
If you want to see what the local hot-up merchants do to them, have a look at
HSV.com.au - The Official Holden Special Vehicles Website
The latest local incarnation runs 317Kw LS3 with 355mm front brakes, riding on 20" wheels, but they are HEAVY .... ~1800kgs .....