hey, wat i have seen done on a few lexus v8's. they run extractors that run forward and have a pip in the shape of U that runs from left to right joining the left and right banks together. then from there it runs into the turbo as a normal single turbo setup.

i was looking for a pic i had of an exhaust setup for a single turbo v8 but thats gone walkies.

i hope that helps

chris