Silver go turn your boost up and see what the stock ECU does without nistune. It revs hard and then cuts like a massive jolt.
Or go unplug your AFM and notice how the car won't rev past 4K it's a safety feature built into the stock ECU to make sure it won't do much damage when it doesn't know the air to fuel ratios.
The aftermarket boost controller connects to a boost source most probably on the intercooler pipe and then into the actuator.
On the stock setup it also has a line going to the intake from what I remember and this is blocked using a screw or in the case of an aftermarket intake it's non existent.
No offense bro but maybe you shouldn't be giving advice if you can't spot an aftermarket boost controller setup