Allan Broadribb

I'm planning on doing autocross. What should I look for in a helmet, I was thinking open face. I believe I have to have one that is Snell approved.

I'll take all the advice I can get on what to buy and where to buy it - obviously I don't want to pay more than I have to!

Thanks.

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Allan Broadribb
'70-911E, 2.2l with Webers