in my experience at many, many drag strips drag strips don't really look too closely at whether the helmet is improved or not. infact i can't remember the actual snell rating of my helmet ever being checked at a drag strip (I've raced at 11 of them that I can think of off the top of my head). that's not to say that some might, but it's unlikely that you need to worry about the rating - meaning that in most cases any ol' motorcycle helmet would do. my buddy uses what looks like a 30 year old motorcycle helmet and doesn't get questioned.
my helmet is a G-Force Pro Force Hybrid - it was $200 from saferacer.com
