The best replacement for 13b is 20b.

The best alternatives to 13b are rated as following:
★★★★★  20b
★★★★  12a
★★★  renesis
★★★  2jz
★★  ls1 weight
★  sr20det
★  13f
★  19d
★  11b
  20b engine
  20b weight

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13b
20b
12a