.....more...
Cart -=-
http://www.cart.com/Content/Wallpape...0908W_0001.jpg
....i can see through that carts rotor...
...tell me where it says solid rotors must be used...
grand-am Cup -=-
http://www.grandamerican.com/competi...Cup_Rules.html
Rolex Series -=- specifies solid cast rotors for the prototype series only -=-http://www.grandamerican.com/daytona_prototype/rules.html
JGTC -=- Note the brakes section -=-
http://www.jgtc.net/race/whats/t_reg_e.htm
Spec Miata -=- says nothing about any use of solid or other rotor, meaning all are allowed/permitted -=-http://www.specmiata.com/specifications.htm
944 Cup - the 944 cup, nor the Super Cup say anything about using different rotors in the races -=-
http://www.944cup.com/home.html
so far, out of the classes you listed saying "All Honda Challenge, Spec Miata, 944 Cup, Grand Am Cup, and USTCC cars use CAST IRON BLANK ROTORS. Just face it. What you've been told is false." only the honda challenge, and the USTCC have ANYTHING in their rules prohibiting the use of rotors other than stock.
please, do your research before making responces.......helps in the end
Jay