DD, the RB30 came out in the VL series Commodore and they also has a single turbo variant. The model range was from 1986-1988 and was a fill in for the soon to be buick. I was speaking to a rep at Holden Engine Company and he mentioned that the driveline for an Exec Commodore was around $7000 at the time (non-turbo)...pretty expensive considering a new Commodore was $20000!! They also came out in the locally made Nissan Skyling HR31 model.
The Turbo Commodores were quick at the time...I had a mate riding a Suzuki Katana and was chased by 2 VL turbo police cars and he had an off at 100mph...nearly broke every bone in his body...but the VL's were allegedly right on his tail. Now my mate wasnt that great a rider either but they were good cars.