Coulthard, replacing Greg Murphy for the round after ‘Murph' had an operation on his injured back last week, took his second win for the weekend, having won Race 1.
CLICK HERE for Speedcafe.com's Race 1 report.
In a close finish, Australian Carrera Cup drivers Jonny Reid and Craig Baird shadowed Coulthard across the line.
Three-time NZV8 champ John McIntyre was fourth, dropping from his solid second place finish yesterday.
Kayne Scott, Ant Pedersen, Scott McLaughlin and Andy Booth finished fifth to eighth respectively.
After a difficult Race 1, former Bathurst 1000 winner Steve Richards made his way inside the top 10 by taking ninth, just ahead of Eddie Bell, who fought back after being involved in a Race 1 crash.
Andy Knight suffered a major fire under his Falcon and failed to finish the race.
The final 25 lap feature race will be held this afternoon.