If you go the "up and over" piping, you will need to cut a hole just under your battery. If you use the "back and under" piping (to me thats a bit messy), you won't need to.
I would have to diagree, i think changing the piping to the up and over is not an appealing look, nor is there alot of clearance around the fan, or radiator top hose. There is also more pipework in the hot engine bay....
No offence pred but i would say the hole you cut for "your up and over"is a little messy, shoudl get your hands on a circle cutter thing (specific i know). i use the attactment in air powered tools but id imagine you could get one to suit a powered drill. It has a drill in the center and obviously a circle around it that is serated like a saw. It will cut you perfect circles all day long.
Also there is a perfect circle waiting to be cut near the battery for the up and over pipework, you just have to look closely. I imagine it is what nissan cuts out for the gtr pipework.
I say all this becase i have changed from the up style pipework to pipework that retains the two standard intercooler pipes in the engine bay (excluding crossover). I will have these made up in polished alloy in the near future. My pipework now features less bends, less pipework in the engine bay, has less lenght of pipework between intercooler outlet and throttle body, and has a more stock look.
Some food for thought perhaps....