I'm not sure there would be much of a difference between a H,X,Y pipe design but I could very well be horribly wrong...
I figure if the difference in designs has been so minimal with NA setups then so long as pipe diameters remain 2.5, a SC shouldn't be that huge an addition to the equation and thus change the results drastically. But maybe the higher volume of gas might start to bring the mid-pipe designs into the equation more...
I guess I'd like to see the answer to this as well.. ahha