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I don't think that will necessarily be the case; it will depend on where the vacuum pickup is. The pressure drop in the intake should be a simple function of engine mass flow and intake shape, so unless moving the throttle body grossly changes the plenum geometry the pressure at the vacuum pickup should be much the same. If it's taken off the throttle body then leaving it in the same place when you fit the new throttles should work. What's the advantage of individual throttles - better fuel/air metering?
Thrustvector
With mine I find the rearview mirror being full of bikes tends to remind me.
On a different note: vacuum.
This is required to run the brake booster, air-oil-separator, fuel pressure regulator and a bunch of smaller stuff.
If, for the sake of argument, one were to move from a single throttle body at the entrance to the plenum, and moved to individual throttle bodies at the end of each plenum runner this would (I am guessing) significantly reduce the level of vacuum in the intake upon which the various systems rely- potentially to a point that is too low.
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