Thinking your brave doing that. Don't know much about their turbos but valve springs is the first thing that'll let go, they let the eng rev out more to gain the power. Bottom ends on a BA aren't as good either as a BF2 or a F6. Fuel may be a limitation so a small upgrade to injectors is probably good. Inductions on the B series are average so getting a good cooler & pipework is a plus. I hear a lot of ppl running as standard mods a 12lb actuator ported wastegate, overhauled induction, big fuel system & a dump/cat combo getting mid 300's without too much issue. In short though, if your going to put something like 5 times the boost in without upping the rest of the components, running 98, just keep a bucket in the back of the car to pick up engine parts you drop on the road. Not saying putting that much boost in is bad, but its bad