If you want power, get a tune. Worry about a new boost controller ONLY when you have installed flow mods (3" intake, exhaust, intercooler etc), retuned and STILL cant hit the boost targets you command. You should be well over stock power levels by the time that occurs. Happened for me on an oldish K04 (at Canberra elevation) at around 17 psi above 5500rpm, now holds 19+ to the red line with a 3 port.
If you have a means of logging (AP, Versatuner etc) you can actually see exactly when your boost controller cant keep up when you see Boost drop below what your tune commands but Wastegate Duty Cycle is pegged at 100%
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