According to Sports-carracing.net,
Team Gainer (JIM Gainer) participate in GT300 class by AUDI R8 Ultra.
(not Honda CR-Z
)
They participate in WEC Fuji round by 458GTE, too.
It seems that NOVA (Japanese agency of AUDI) sold two cars of R8 Ultra.
http://www.sports-carracing.net/2012...tm#120108news1