That guy is on the s2kforum. It's a Mugen model with light mods. I think front bar and coilovers. You can see it has a street alignment by the classic under steer on entry with massive oversteer on exit these cars have with street alignments. They can be unpredictable.....but very fun.
That thing holds good speed, better than the M4 trying to play with him. Sounds good too. Given all the ring accident videos out there some of those rear end slides would have made me a bit nervous!
I wish I fit in these cars, I like my M3 but I always thought the S2000 would be a lot of track fun. I don't fit in Caymans or Boxsters either, which is a great tragedy, they just aren't for tall people.