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* There are different snell ratings for different sports. If you go to this snell webpage and click on a given certification, they give a listing of various helmets (brand and model) that have that certification. They might also explain what the differences are in certification, but I didn't look that hard. http://www.smf.org/cert.html
* I have no experience with auto racing helmets so I cannot answer the height/clearance question other than to say I think they will be very close to the same height as m-c helmets. I would also expect full face and open face helmets to be very close in height.
* While looking around, I found Bell has a pretty good page on finding the proper helmet fit. http://www.bellhelmets.com/fit/fit_set.html
2001 Honda Prelude Type SH/ 2011 BMW 328xi / 2011 Honda Pilot EX-L w/ Navigation
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