Looks exactly like my frontpipe, 3" and all rusted up (mild steel), even bottomed out in the exact same place. When I brought it ages ago I was told it was a Nismo frontpipe, but there isn't any Nismo branding on it. So it's either a old-style Nismo, Nismo copy, or Fujitsubo (looks identical in my jap GTR parts list catalogue, even the position of the flex pipe)