Helmet Requirement for IHRA

what is the SNELL/SFI requirement in the 2013 IHRA rule book?

need to read pages 77 - 98 of the rule book

thanks

What speed, class etc.

available online

http://www.ihra.com/competition/rules/25-ihra-motorsports-2013-rulebook-supplement/file

Rickster

in the 1/4 my car runs 11.80's, the other car 10.60's