Autosport web reports hybrid system of GT300 Prius.
*The Prius is a MR layout. It has midship engine.
*It has a rear caliper for regeneration.
*A battery is installed in a passenger seat.
*A motor is installed behind transmission.
*The same parts as road-going Prius are also used.
http://as-web.jp/news/info.php?c_id=2&no=38559