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Maybe,
Check with your local DE organization (PCA, POC, SCCA) to see what they require. Most track events now require Snell SA rating.
The differences:
Snell SA rated helmets are fire resistant and designed to protect you in a multi- impact collision. They are usually a little heavier and have less visibility than M rated motorcycle helmets. (recent Snell SA2005 rated helmets from Zaamp and Pyrotect are good quality for a lot less $$)
Snell M rated helmets are designed to protect you in a single impact collision, are not fire resistant, are lighter weight and have the best visibility.
Good hunting.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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