The best replacement for infiniti g37 is bmw 335i.

The best alternatives to infiniti g37 are rated as following:
★★★★★  bmw 335i
★★★★  acura tl
★★★  audi a4
★★  lexus is350
★★  bmw 328i
★  nissan 370z
★  lexus is 250
★  nissan maxima
★  audi a5
★  acura tsx
★  bmw 335
  nissan altima
  lexus es
  mercedes c350
  lexus es350
  mercedes c300
  nissan 350z
  2009 acura tl awd
  audi s5
  hyundai genesis
  lexus is250
  2009 bmw 335i

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infiniti g37
bmw 335i
acura tl