Murphy will drive the Mike Pero-sponsored Holden Commodore over seven rounds held at Hampton Downs, Ruapuna, Manfeild and Taupo and Lobb will join Murphy for the endurance rounds at Taupo in August, Hampton Downs in September and Ruapuna in October.
Lobb has had limited time in the seven litre engined race car but was impressive with just several laps around the Hampton Downs circuit.
"I had five laps in the car first off and then the next session I had just 12 but was just one and a half second off Greg's time and fastest in my group so I was happy with that," Lobb said.
"The cars are mint and they handle so well they feel in some ways like a really powerful large kart."
Murphy currently sits on 625 points over Hamilton's Kayne Scott on 497 and A1GP driving star Johnny Reid on 471 with six rounds remaining. Race three on Sunday was won by Rotorua's Ant Pederson who sits in fourth place on 455.
The V8 Supertourers next contest the series at Powerbuilt International Raceway in Ruapuna, Christchurch, over April 7-8.