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Yes, I believe that is the case. A manual boost controller is basically just an adjustable restriction.
From hackaday.com: "A manual boost controller is placed in the path of the waste-gate's sensor. The controller bleeds off some of the pressure in the line so that the pressure measured at the waste gate is lower than actual. This tricks the waste gate into staying closed longer than usual so a higher level of boost is reached."
This way you can adjust the boost with out cracking open the waste gate, and can go back to stock by removing the boost controller.
No real reason to bump up boost unless you have bumped up fuel as well, and have some way to control and monitor EGTs.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver
1982 300SD - 232K miles - Wife's Daily Driver
1986 560SL - Wife's red speed machine
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