I have done this, home welded manifolds, dump pipes, Used E6k Ecu, goes awesome. Just got it on the road, only running 10psi. So far very good, lots of potential yet, shall let you guys know how it goes...
At the moment, it gets boost at 3500 rpm and then the boost hits hard. I highly recomend this sort of biuld up. Its cheap too!
Im using staged injection with 12 injectors.