I have a front-mount intercooler with piping for sale, the kit came off my 180sx after I fitted a new hybrid kit (wanted a bigger core).
The piping is all "mandrel" bent mild-steel, painted black. The core measures 630x200x57 and was custom made for my car. The piping has a generic blow-off valve adaptor on it and a nipple for connecting a boost controller also.
It should be a bolt-on kit for a s13/180sx, only thing you might need to buy are a few hose clamps and possibly one rubber/silicon joiner. The kit bolts on with no cutting of the front bar/rio bar...only mod that is required is the usual cutting of the battery tray.
Looking for $300 plus freight...semi-negotiable.
Picture of the kit fitted to my 180sx
here and
here