Toyo cup is torsion bar only, so no 964s.
I just published the proposed 2006 rules, here
http://www.addictionmotorsports.com/toyo_cup.htm
I would encourage all to read them, but please don't join in the discussion on the Toyo Cup BBS, we are only going to listen to those who have raced a car in 2004 or 2005 anyway since they are the ones who have something invested. This is my first ever time on a rules committee and is is tough telling people that next year their car will not be in spec, even if it was never in spec in the first place. In the big picture, it is a good thing, it means that the class is growing and has sufficient interest to require the tightening of the rules, and the proper enforcement of them as well.
Jim