Can you put smaller wheels on the car than what the spec line says? For example could an rx8 run 17s

"Cars originally equipped with twelve (12) inch wheels may fit thirteen (13) inch wheels. Cars originally equipped with metric 365 wheels may fit fourteen (14) inch wheels, and cars originally equipped with metric 390 wheels may fit fifteen (15) inch wheels. The above-mentioned cars as well as those cars originally equipped with thirteen (13) inch or fourteen (14) inch wheels may fit up to a fifteen (15) inch wheel. Cars may not fit wheel diameters smaller than those listed on their spec line. All other cars shall retain the wheel diameter fitted as original equipment for their make, model, and type. Knockoff/quickchange type wheels are prohibited. Wheels must be made of metal. Cars classified in ITR may utilize any wheel diameter up to 17” or retain their stock diameter wheels if larger."

Kind of contradictory, but I read that as saying ITR cars can use any diameter wheel up to 17", or their stock wheels if larger.