My coldpipe is an aluminum one that I got lucky and found on eBay (for kind of a lot), and my hotpipe is cobbled together from some mild steel bends that Sean tacked together for me.
ProjectNissan is having a sale on polished aluminum hotpipes. $38 ain't too bad. All you have to do is get a flange for your BOV, and modify it a little to get it to fit.
http://www.projectnissan.com/s...=4273
I run PS stuff (O2 housing, downpipe, test pipe, and t/c rods) and it is really great quality.