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Not all the ports on the tb are vaccum, I know at least one of them is but some of them source on the turbo side of the tb plate (vs the plenum side) so thier pretty close to atmospheric at idle. The mbc being on the same line as the bov shouldn't matter as long as they are both getting a solid vaccum/boost source. Is the bov/mbc line connected to the port at the front of the intake plenum? If you really wanted a seperate source for everything you could run the bov off the port on the front of the plenum and then you could use the big fitting on the intake runners that is supposed to be for the pcv valve as a place for the mbc line assuming you have a catch can.
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