Checkvalve between brake booster and intake?
 

I am wondering if you guys running turbo set ups are running a non return valve or check valve between the intake manifold and the brake booster. Also on which hose did you hook up the bov? I can only see one hose that could be used for that purpose. Lastly, the second hose on top of the intake manifold going down on the back of the block on the passenger side, should this get a check valve as well?

Most brake boosters have check valves built in so that you don't lose braking force if the engine should shut off.