This car has been a regular over many years at the Kataoka Racing Service Battle Royale racing series, held at Central Circuit.
Youtube video:
http://www.youtube.com/watch?v=oHrygj3qehsThe entry indicates it is an Aquarius Racing built car.
It does not have DOHC badging. It might be a SOHC or OHV engined car, or it may have been converted to a DOHC but the owner does not seem to care about dressing it as a GT-R.
All of the dark colored panels are naked carbon fiber from Restored (mentioned in the carbon fiber and fiberglass reproduction panel thread on this forum).
Determining the year of the car based on the type of hood and details of the carbon fiber panels is not going to be accurate, because the carbon fiber panels are available only in the short hood/bonnet with hood vent style.
The hood, cowl, fenders, doors, and trunk lid total $7,300 USD excluding shipping or any taxes (in November 2009 exchange rate).