"Because the TRF101 is so new and has an unknown differential in performance to the F104, its legality in the TCS series is on hold for the remaining 2013 regional events including the Finals and will be reviewed for 2014 season. We will have a better understanding of how the chassis performs in relation to the F104 line and can proceed appropriately."
David Jun of Tamiya USA
Buyer beware!! It appears that you may want to hold off the TRF101 if you are planning on using it for Tamiya TCS events in the USA.