The upper intake is the only place you want. Preferably the intake manifold over any nipple on the throttle body. Items such as a fuel pressure regulator are gonna be looking for the boost referenced signal, as most of the aftermarket ones raise fuel pressure on a 1 to 1 ratio. What does this mean, 43 lbs at idle, no boost, and with 10 pounds of boost and your fuel pressure will be 53 lbs. It helps the injectors overcome the extra 10 lbs of pressure in the cylinder. As for the bypass valve, the vacuum is what keeps it open letting it divert air when it is uneeded. When the valve closes, its now gonna have boost on the oppisite side of the piston, which would force it open if the vacuum line wasnt supplying the same amount of pressure on the back side of it. As for your brake booster, it has a one way check valve in it (that black 90 degree thing) that keeps boost pressure from entering into it. The thought holds true but only sorta, when are you braking and building boost at the same time. The only time i can think of, would be a burnout, but trust me, the brakes will hold the car if you get overzealous with your burnout while building boost, it just requires more pedal pressure. Your not gonna be very subtle with the brakes anyhow using the brake gas heel toe method anyways. That leads us to the pcv. In theroy, the check ball is only open under vacuum, thus under boost, it should close preventing boost from reverting back into your crankcase. From my moth to valve blow test, this didnt hold true on 6 new ones i tried in the parts store. Yep, I was the idiot standing in the store blowing on the valves backwards!!! Ive read that the turbocoupe valves seal up tight, but i went the route of "Built ford tough using chevy stuff". By that, I mean i intalled an inline (180 degree unlike most that are 90 degree) one way break booster valve from a 20013 impala. My pcv valve routes as follows, pcv hose to sealed catch can, hose from catch can to inline brake booster, back to my intake manifold source. Air can only be sucked from pcv. So what do i do to vent crankcase pressure while making boost, I have a breather on my oil filler valve cover. I think 2 would be better, but I dont have my driverside valve cover drilled for it. Hope this long as rant clears up a few things.