The best replacement for b18c5 is k20.

The best alternatives to b18c5 are rated as following:
★★★★★  k20
★★★★  b18c
★★★★  b18c1
★★★★  h22
★★★  b16b
★★  jdm b18c
★★  b20
★★  k20a2
★★  k20a
★★  b18cr
★★  b20 vtec
★  h22a
★  b18c type r
★  b16a
★  ls vtec
★  b18c6
★  k20z3
★  b16a2
  h2b

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b18c5
k20
b18c