When I took mine off, I first took the EGR vavle body with the throttle valve in it off completely. You'll need to disconnect the link rod which comes across the top of the engine to the thottle valve. This frees up one end of the resonance crossover manifold - there's a large O ring between it and the EGR valve, so it'll need a bit of a wiggle to free it.

Then, there's just the allen bolt at the other end.

At this point, the manifold should begin to feel a bit more free. Give it a wiggle, and you will be able to free it from the O rings at the IP side of the engine (I think driver's side for you). Now, the only things left connected to the crossover manifold should be the vac pipe itself.