That was an issue with the locking lugs. Some dealers put the 350z locking lugs on the 370z. I doubt this would have been the cause since it looks like the part where lugs wheel are located remained intact.

Good call... Maybe a broken axle? Its good to see the OP walked away from this!

These cars become pretty awkward when you are out of control.. it was probably just an "in over my head" situation. I know at the track I have had 1 of those.. When youre in the moment, it even feels like you broke something.

I'm going to have to chalk this one up to hooneries + no VDC, but hey at least OP is able to walk around and tell the story. It should go something like this:

"Yo so it was a clear dry night, no one in sight. I wanted to feel the power and shift like Vin Diesel while sliding through a twisty turn. So I turned off my VDC, getting more poooower and decided to throw this biotch hard through the turn. As I'm sliding and smiling I slam her into 2nd. Next thing I know, omg, the car is shaking and all by itself turns around, out of control and slams into the curb. I'm telling you man something was wrong with her, something broke and caused me to wipe out. Definitely wasn't me!"

I know this is a little off the OP's topic but I had a set of 18x8 Rota Tarmac 2s on my WRX for about two years and I can say that I have SLAMMED a few pot holes at speed that I didn't see coming and I never had any problems with them. I also had and still have many friends running Rotas on various makes of cars with no complaints.

I'm planning to purchase another set of Rotas in 19/9.5-10.5 +20 for my Z. Hardest problem now is deciding between the Grid (Work Te37) or P45 (Nismo LMGT4).