Right, it's an SVT. Sorry about that.
Thanks for the help. So "emission control devices may be modified or removed" covers the cat? I searched the rulebook for catalytic and came up empty on references to removal.
Pkolator - This will be my sixth season. I'll be running at Rantoul with CCSCC. The surface is poor, but it's a good group of people and a nice drive through the sticks if you get off the interstate. (It's a shame what passes for a nice drive in northeastern IL!)