Go to the helmet company website (Impact) and look up the ratings.
http://www.impacthelmets.com/impactvelocity.html
Or call them.
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Retired: '06 BMW E46
///M3
Current: '08 BMW E60 DINAN
///M5, Interlagos Blue, SMG
DINAN Stage 2 Suspension, Exhaust, Stage III Software, Front strut braces,
Intakes, 13% Underdrive pulley, 3.91 Differential, RPI Scoops.