ecu flash

So I had a quick question due to my ignorance on the subject. If I upgrade my Turbo from my stock one, do I need to flash my ECU? I recently replaced my timing chain and VVT, Cam and crank position sensors, rebuilt my high pressure fuel pump, replaced injectors and fuel rail. I am beyond certain...

Yo, new here so I'd appreciate the help. Got my car back from the mechanic yesterday and drove it home. Needed a tune up so I started the process with freektune right away. Next morning I get in the car and start it with no problems whatsoever. Turn it off and try flashing the ecu to a different...