i have a sti v7 vf 35 turbo

what is the max safe boost pressure that i can drive?
without engine failure?

do i have to chage the spark plugs when i raise my boost pressure

i have pink injectors and going to install a walbro 255

i heart something about fuel cut what is it? and when can i get it?

what are good boost controllers or is the ecu better to do this it self?

i hope to get around 350hp?