So a tripple compound is making 1000+ while a quad is making 1200+ I am not sure why some are suggesting a tipple setup then? Im not creating an argument per say, but a reasoning for which direction to go, IF I proceed with this project.
The setup under the hood of Nicks truck is awesome to look at, and seems functional... did he ever fix the issue of it randomly not starting? I had heard the up-pipes were pretty close to maybe the crankshaft or camshaft position sensor? I know at TS it had a couple no starts on him out in the parking lot. Again, I haven't read about it in a while so it may have been nothing. The setup is so tight under the hood, it would probably be a project by itself just to get air filters on the thing. I've never seen it with filters on it to date.
The triple compounded setup will make whatever you spec it to make. If you have the fuel supply, and the appropriately sized turbos you can do whatever your heart desires. You can do it with two if you want, instead of making three. I know you like the factory 6.4 compound setup, I think that's great for street driving and then hanging one large atmospheric out in front of it for the all out power on the track... golden.
If you're looking to build a truck that lives it life running at the drag strip and will never be registered for the road, I wouldn't even bother with that, I would do a simple compound setup with two non VGT chargers and have at it. I see no need to complicate the hell out of everything with four turbo's. Nicks truck is setup that way so he can make easy and big power on a truck that can still be somewhat driven daily, and keep the smoke levels down.
I like the ideas being thrown around, but I think you seriously need to get a good grasp on your goals and what you want this truck do to before spec'ing anything. Is the idea of stock 6.4 compounds on each bank cool sounding? Sure. Is it practical? Maybe not...