Simplifying the vacuum system has many advantages. As these cars age, there are all sorts of vacuum gremlins that can arise...boost issues that can be very difficult to diagnose.

Here's one person's approach:

https://lh5.googleusercontent.com/-9cBEIu4dcas/UAZEQ4LzTiI/AAAAAAAABpI/Xf0tT4reobU/s576/60X%2520Engine%2520Vacuum.jpg

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife