I've had my heart set on a twin turbo upgrade from my GTRS to 2835s. However, HKS recommended, in fact strongly suggested a T04Z setup instead. Problem is that at the time I was going for the 2835s, the T04Z kit sold...
http://www.blogsmithmedia.com/www.autoblog.com/media/2007/06/sard_suprahv-r_lo.jpg
Last year, Toyota Team SARD fielded a http://www.autoblog.com/2006/07/05/toyota-fields-lexus-gs450-hybrid-racecar/ in the Tokachi...