The best replacement for 421 is 41 header.


The best alternatives to 421 are rated as following:
★★★★★  41 header
★★★★★  406
★★★★★  41
★★★★  414
★★★★  sm57
★★★  57
★★★  434
★★  441
★  21 texas eagle
★  221
★  piper navajo
★  shure sm57
  re20
  king air

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421
41 header
406