My b16b came with the manifold but no down pipe. I have an apex cat back system that was previously mated with my old d series. What down pipe will work? I've seen an itr downpipe and a gsr one will they both fitt? Also if someone could recommend a site where I could find a decent one piece header without spending buku bucks. ? #2 my old high pressure power steering will not fit on the ctr pump, which one will work for my application ?