Originally Posted by bgkast

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."