Yep. The only way to do it where the computer does not cut boost is to change the wastegate on the turbo to a pressure control instead of a vacuum control thereby bypassing the computer. Plumb the turbo to the intake maniford and install a manual boost pressure control inline from the intake to the turbo, then block off the EGR and/or plug the vacuum line to it.

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K