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An electronic boost controller (EBC) is best, especially when it's closed-loop with it's own dedicated MAP sensor.
Of course, this will tend to be the most expensive option.
A manual boost controller (MBC) does allow increases in boost, but this preset level changes with ambient temperature, humidity, etc.
The EBC will always hit it's preset boost level no matter what the ambient conditions are.
Adjustable wastegate actuator rods are a waste of time, as this only changes how fast (or slow) the boost ramp hits when the wastegate is triggered.
-Ted
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