I made a manual boost controller and will be installed by tee-ing in the wastegate rubber hose. Before installation, what should I set the MBC opening pressure to initially before dialing it in by trial and error with the boost gauge?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked