I asked about helmets recently, the thread can't be too far down. Some of the guys thought I was cheaping out at $350. Maybe so. Like the old proverbial Bell helmet ad said, if you have a $9 head buy a $9 helmet. lol.
I'm still leaning toward an Impact or Simpson. One concern I had is the window size on a full face auto racing helmet. I had one and it restricted side vision on the street. That may be OK on the drag strip but not with intersections and traffic.
I'm going SA2015 so it's fire resistant. SM2015 is motorcycle type with a standard interior.
I wish my driver/daughter wore the same size helmet as me, I'd take hers and buy her an even more expensive (Carbon) one. This year our Helmet, seatbelts, flywheel, bellhousing, trans case and I'm sure something else's certification expires.