The rear manifold is either capped at the exit or a custom one is used.
See that large single pipe that comes out of the turbo and makes the downpipe? That'* where the exhaust comes out.

Yes, I see it now.
The rear exhaust connection is blocked off and only used as a mounting support.

Oh, ok, thanks for clearing that up!

So basically that rear manifold can't flow that well, the angle'* all wrong, isn't it?

Hence why, as mentioned above, a lot of guys will put on an Fbody manifold, or have a custom one made. Flow is important, but it doesn't have to be the best with boost. It'* also important to keep the exhaust hot until it gets into the Turbine housing, if the exhaust cools to much it wont spool the turbo as quickly.

It'd be almost impossible to have one manifold dump into the exhaust, and one into the turbo. Each bank would require very different tuning due to backpressure/scavenging differences.

Hell, the big power guys have problems popping pistons because of unequal pressures in the stock manifolds. I thing trying to run a turbo off one bank would probably blow it sky-high.

Yep, you're right about that.

I think Cartuning has a cheap modified rear manifold available, they change #6 primary to flow in the direction of the turbo as opposed to flowing toward the old downpipe.

Cheers,