Where is the ECU located in a DC2 VTiR. How would I be able to determine if it is an aftermarket item?

Also I have read that a stock ECU on a turboed engine goes into limp mode when it sees boost and cuts out and stalls.

Does that mean if the ECU in the car was stock it wouldn't be able to hit boost comfortably as my car hits boost perfectly and smoothly.

Just wanting to make sure, and see if I have to get one or what not

Cheers and thanks in advance