Im on the look for HFCs too, used ones are hard to find, so will end up going new soon.
As for the intake I think gen 3 stillen and hfc combo would be great.
The emblems yes there are ones that are perfect fitment, you just have to do your research, I did find some on a site a while back they were like 75 a pop
You can also try plasti dip but I dont know if you want that cheap feeling, but the store name is like Z store or something like that,
make sure you get the ones that say they fit 09-12 370z
