I run mine at around 15 psi. Before I got the controller, I was below 10 psi and I could tell a difference. Boost does nothing without fuel. I never have adjusted the ALDA and think it is foolish to go above specs with it. Especially with the 350 engine. The thing I like about a manual controller is that you build up to full boost quicker. Without it, as boost builds you are gradually opening the wastegate and bleeding off boost.

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