yeah, my bad, i should have looked it up. ITB is 6" too. What SP class did they stick you in? in the old days we went to CSP based on the words "corresponding SP class" we thought that meant ITC went to CSP and ITB went to BSP. Didn't matter much because anyone in a real SP car was going to beat us. But now we understand we should be in FSP because that is where the SP 3G Hondas are.