Update...Finally got one of these turbos in my hands, and it looks fantastic.
Couple of pictures:
On the left, the new 6870 with the largest (1.32 a/r) turbine housing and on the right is the standard 6266 with the 1.15 a/r housing:
The business end:
Now the important picture:
On the left is the 6870, and on the right is a 1.32 a/r turbine for the 6266 turbo. As you can see the two are identical in diameter. This means that the larger 68mm turbo is going to be an option with this kit, without any fitment issues.
This turbo is rated to flow 110lbs of air per minute. That really opens up the 800+whp door with E85 fuel.
Another quick comparison...6870 T4 1.32 twin scroll vs 6870 .96 a/r tangential vs 6266 1.32 a/r T4 twin scroll housing:
The .96 a/r housing (non twin scroll) is much more compact, and would work just as well with the V2 manifolds.
I am doing a complete install for a local customer in the next couple of weeks and will get a chance to really check how this looks on the car. Will update this thread at that point.