There are cool custom set ups ive seen
But if your worried about f'n up your rig I would go w/ an ARB unit
Its well laid out, comes w/ a nice template so you dont cut in the wrong location etc. My only gripe is how the tube runs in the inner fender....if you want to trim in the future it will be hard to do.
The ARB is only $235 or something like that if you hunt around....unless you got stuff laying around your still going to be in for close to $100 in supplies , if you want something that looks good too?!
Chewy
PS: while it will help your motor run cooler, and prevent a hydro lock , how many other things will get fried from being dunked in H2o? lots of stuff goes wrong when you go swimming in an xj , a snorkel is not going to stop your PCM, TPS, IAC, Alt. and relays from getting screwed up.... not to mention what water and grit will do to unit bearings etc