I would assume some very well placed studs w/ a few missing could be done but you run the risk of blowing your manifold gasket out. If any of the studs you put in did back out, and they will, then it could create a gap and all that hot exhaust gas will eat your gasket up! Plus, exhaust leak = less/no boost + lean.
I would just try to get them all in there.
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Hahn 20g (was 16g) w/ DW 650s  , W/M, Custom 3" O2 Housing and some other goodies.
No returnline!
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