Just booked a dyno appointment for Saturday. Gonna do a few runs beforehand, then install the manifold and get some "after" results. I've gathered pretty much all of the parts I'll need to install it and will share a DIY/parts list after installing it.
In theory your boost should be lower as the intake is less of a restriction and the air is flowing more uni-formally into the head, from my understanding. However, you still have the head as the next restriction so it really might not be much of a change on it's own.
It would be interesting to see how much the head could be ported and then portmatched to the DR IM. Obviously would need a custom gasket.
Be neat to see your results. I'm hoping for good gains for you and for everyone else who preordered this aftermarket intake manifold with zero proven gains. I don't think anyone can say the gains of the DR custom sheet metal tapered log with trumpets spaced off the floor will be the same as this cast manifold. At least not yet. Not exactly apples to apples.