NOTE:  
please review the tables if
you plan on using these
numbers with modified slot
lengths in the plates.  The
WRX chart is for increasing
the travel slot 0.5".  The STi
increased travel chart is for
0.2".  This is due to the stock
caster being larger initially.
Charts for GD chassis WRX (Stock 3.5 Degrees of Caster)
Charts for GD chassis STi (Stock 4.5 Degrees of Caster)
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Camber Plate only to "Camber/CasterPlate" Modification
The cusco camber(and most other) plates that allow for an additional 2 degrees
of negative camber can be re-drilled for mounting at an angle to increase the
caster as well.  The slot can also be increase in length.  The chart on the right
reflects and addtional 0.5" to the slotting.  Below are some images of the
modification, perform at your own risk.

Happy Modding,
Justin
As an update to this page, I can't
remember how accurate any of these
numbers are at this point, but hopefully
you get the idea.