For episode four, Steve Pizzati drives the most powerful car ever built in Australia - the HSV W427 at Holden's Lang Lang proving grounds.
Warren Brown and his indigenous tracker Diesel attempt a trek across Western Australia on a horse whilst Cox and Pizzati tackle the challenge in a TRD HiLux fitted with a Follow Me GPS.
The star in a bog standard car is Jack Thompson, most notable recently for his role in the new epic film 'Australia'.
Finally, the team tries their hand at lawn bowls Top Gear style, rolling a bunch of brand new Holden Astra's down a ramp towards the jack.
Top Gear Australia airs Monday nights at 7:30pm on SBS.