solenoid

Hey guys I´m new on the page, I am on the procces of making my 135i n54 09 to doc race st 6266, i have doubts about how the motiv boost box works with the mhd, and how is connected the mac solenoid to the wastegates So how do I use the MHD to control the Motiv Boost Box or does it control...

I am fbo with inlets outlets fully catless walnut blasted 5k ago new injectors and plugs 15k on hpfp and turbos and now my wgdc is high. https://datazap.me/u/robby37/high-wgdc-i-think?log=0&data=3-22 Could this be boost solenoid aka pressure converter I changed one 10k miles ago because was...