[John Rogers]

That appears to be in a bus, type 4 maybe so the fire order is 1-4-3-2 so one side gets the air charge then the other side. Or cyl 1 gets some air, then over to 4 and 3 then back to 2 and then 1 again. This would probably negate any distance worries? Additional things to consider, the inside of the pipe is probably oil coated (our 1987 930 is) so frictional losses are minimum from the surfaces and the velocity of the air charge is very low, not enough to worry about the velocity losses. Why is that, figure the cylinder capacity for the 2L engine then figure RPM, say 6000 then what is the turbo output in relation to that and you'll have much more air than you'd need.