The best replacement for z6 is y8 head.

The best alternatives to z6 are rated as following:
★★★★★  y8 head
★★★★  y8
★★  y8 manifold
★★  zc
★★  v3
★★  z8
★  y7
★  z3
★  y8 intake
★  z5
  zeiss diavari
  e6
  z85
  tour v3
  d15b
  a6
  w580
  leupold gx-3i
  pro60

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