With 3" exhaust and using stock VNT vac solenoid to control boost you will get more boost spike than with a stock exhaust. Tillix or Dawes will control max boost (eg:nom 16psi). You need to control max boost with or without the throttle controller.
Suggest U control max boost first.
I have a Dawes valve, a boost take off fitting for under MAP sensor and EDS scan tool (for clearing fault codes), I can help you out with these(save $$$s). Where are you located. No pressure mate. Suggest try running say Dawes/Tillix with VNT vac solenoid(no needle valve). Some will object against this setup but if it works with stock ECU would be worthwhile (very linear spool).
Throttle controller adjusts the signal to the ECU from the Throttle Position Sensor and does remove significant throttle lag caused by drive by wire..
Good that you have an EGT and boost gauge installed. Let us know some readings that you get different situations:
Max Boost you have noted with fast acceleration with load on eng?
Boost and EGT @cruise on hwy slight load @100kph?
EGTs hauling up hill (eng loaded up?
Manual or auto?
Attached is my comparo dyno result_Tillix with VNT vac Solenoid(no needle valve) with and without throttle controller.
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