standalone boost controller?

[steveR5GTT]

sorry log as my bro.

[allanr5gtt]

sorry log as my bro.

hi all
i have a dta ex 48 exp and wanted to use the ecu to control the boost. at the moment i'm just using the pre load of the actuator at 12 psi.
what harm can using the actuator at 25 psi instead of the ecu boost controller ?
if i need to use the ecu to controller the boost can i use an n75 valve ?

also reading Os8472 eif project does the actuater pipe have to go before the throttle body? why?
why can you run the pipe either side of the throtttle butterfly when using a carb?
thanks allan