Who started building there 408 stroker today? this guy right here!!!

Most Ford Diesel turbos are CCW rotation as opposed to the more common CW style. So one and one would be a assymetrical looking install, 1 large one..hang on...2 is twice the plumbing, 2 BOV's, intercooler entry issues, yadda yadda. Sure it may spool faster but space consideration is a big issue, and that space next to the passenger valve cover is rearing to get stuffed with some snail.....