Kenny Tran is one of the best there is, especially for the Scion tC. He won the NOPI Nats in Dallas and has the fastest ET for a street chassis tC. No the 2AZ-FE mind you, but still a full bodied tC from the firewall back. I helped him load onto his trailer at his shop,
Jotech Racing. It is located in Garland, Texas (my Hometown) on the East side of Dallas. His shop also built the 500HP Nitto tC.
That is my baby sitting next to it in front of his shop. While you are there, go next door to gas station and try one of their burgers. They are awesome.
TB stands for Throttle Body. It is like a carburetor for a fuel injected system. It controls the amount of air entering the lower intake manifold and thusly, the engine. The 2AZ-FE is drive-by-wire technology (no cable). This can easily be seen by looking at the arm of the gas pedal.