Funny you should should mention that book, I do have that book and have skimmed through it. Im not to the point of changing my turbos out yet, but im leaning towards 530/550BB w/ MS manifolds. I really like that 510 with the VG30TT. I understand the need to keep thermal efficiency on the exhaust side to keep velocity up and that spool is also heavily effected by the pressure differential between the two sides of the turbine, and that by having the long piping before the turbo you would loose a decent amount of heat. I also saw in the book where it tells you it is "ideal" to keep plumbing to a minimum. I dont plan on going this route, just curious of what the opinions were for this.