I was wondering if anyone knows racers using a Pro II model racepak in Top Dragster class? According to the document link below, it only explicitly states that TF, FC, TAD, and TAFC are designated classes unless I am misreading the data table. The document's Data Recorders section was last updated May 2014. The PDF itself shows a revision date of last week so it appears to be a current spec sheet. http://promod.nhra.com/userfiles/file/NHRAAcceptedProducts.pdf If it is truly not allowed in TD, does anyone know why? Since you are only logging data and the category itself permits such action, it seems irrelevant. Definitely curious as to the actual answer.