The blue 20b 240z is my car LOL.
Tweakit did the base tuning to get it drivable for rego but they didn't build it.
The car in the add is Justin from Tweakit's car, saw it a couple of years ago when they tuned my car. The car looked fairly solid, but only had a quick look.
Not sure about it using the factory twin turbo's. When I mocked up my engine they didn't clear the rails by about 50mm. They are a tight fit in a RX7 and there rails are around 100mm wider appart.