The start of something big. The 2004 model was the one to take the most criticism.
xB RS 1.0 only available in Hot Lava Orange with 2100 units produced (504 units w/5spd, 1596 units w/automatic).
xB RS 2.0 only available in Solar Yellow with 2500 units produced.
xB RS 3.0 only available in Envy Green with 2200
units produced.
xB RS 4.0 only available in Maziora Torched Penny (polarized goldish-brown)
with 2500 units produced.
While there was no model for 2007, they did make a exclusive model, released in the latter part of 2006 - classified as a 2006.5 xB.
xB RS 5.0 only available in Gold Rush Mica with 2500 units produced (First RS Scion other than the tC to have a sunroof).