Sorry Tomcat you really didn't understand the concept of a supercharged engine. Below full throttle height every supercharged engine produces more boost than it can handle. Guess where the name full throttle height comes from ... exactly it's the height where the throttle can be moved fully forward without overboosting the engine.
There is no magic device needed to get +17 boost from the engine, it's simply the supercharger that is capable of producing this pressure at sea level. Of course this is a overboost condition for the engine and will kill your engine in no time. That's the problem with supercharged engines, the pilot has to keep the boost below the limits and has to adjust the throttle with every altitude change (as boost changes with altitude).
Thats why there is the automatic boost control that limits the engine boost below full throttle heigth automatically. However there might be a failure in the automatic boost control or a emergency situation ... so there was a boost control cut-out that disabled it and allowed the pilot to control the boost himself. Then however he could seriously overboost the engine. So they modified the engine that even with disabled boost control the boost pressure couldn't be raised above +12 boost.
So the "modification" didn't allow the engine to produce higher boost, in fact it limited the boost from around +17 to +12.
PS: Please use whole words to write your sentences it's hard to make sense of these abbreviations.
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