Don't you worry about primaries length etc. ? Turbo manifolds are much shorter than N/A...
I'm asking because I think about making headers for my ZX-9R... and to make "inboard" exhaust system... like this:
http://youtu.be/yDxkeSDYR4w
The main reason is.... LHD car + exhaust at left side of car = headache
So my exhaust should be "inboard" with exit on the right side or... "outboard" with silencer on the right.