Some facts about the Invitational,
As can be seen from the pic of top 3, body of choice was Excel or Ride Accord. I was using a Stratus 3.0 carpet version initially and switched to the Excel as it provided much more stability
Wheels and inserts are not controlled. JB foam was the obvious choice for most racers. Many Japanese racers used Tamiya dish wheel. They said tamiya wheel provide more traction compared to say Yokomo wheels. I found this out too late
Many racers initially tested higher turn motors when the traction was not good. Finally most of the racers settled with 6 or 7 turn motors as far as I know. The fastest car was hara's cyclone. He was just ballistic down the straight!
KO's staff was at the race to help programming the VFS escs and repairing any burnt ones.
Top racers all used GP battery. Intellect are more popular among the locals.