Well, this is pretty typical of what is (was?) used in Australian V8 Supercars:
Here is similar to what NASCAR uses:
One of the EMC teams used this one year:
a tunnel ram is essentially that, except with the carburetors sitting over the runners and the bellmouths flush to the floor. Plenum volume on this manifolds are too big for circuit racing. I don't know what the insides look like, but I believe they're a bit like this:
Basically a tunnel ram with lid.
In regards to Acoustic Wave Action vs Mass Inertia, This is one of the all time great threads here:
Vannik, Schmidtmotorworks, and Nitro2 are the posters to pay attention to (not that others don't add anything, they certainly do!).