I just thought I'd bring this topic up for your consideration. With the new requirement for SFI spec'ed 38.1 Head and neck restraints comes a new item to replace: the helmet teathers. BMW club racing has required these for about 5 years now, and this is coming up for non HANS devices that don't require teather replacement.

For you reference:
http://forums.bimmerforums.com/forum...4#post21174204