The best replacement for sr20 is rb25.

The best alternatives to sr20 are rated as following:
★★★★★  rb25
★★★★  rb20
★★★★  ka24
★★  ca18
★★  sr22
★★  rb26
★  2jz
★  ka-t
★  ka24det
★  4g63
★  1jz
★  da40
★  k20
★  rb
★  182
★  ka
  ka 24
  vq35
  ka t
  172
  ej20
  fj20
  b18c
  3sgte
  f20c
  4age
  diamond da40
  rb 25
  cessna 172

Your alternative for sr20 is not listed? Suggest!
Speaking about sr20, one probably shouldn't forget about ka radiator.

Other search terms related to sr20 and their ratings are:
★★★★★ ka radiator
You have in mind a companion for sr20 and it is not yet here? Propose!



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