The best replacement for aem is injen.

The best alternatives to aem are rated as following:
★★★★★  injen
★★★★  k&n
★★★  hondata
★★★  innovate
★★  afe
★★  kpro
★★  haltech
★  innovate wideband
★  k&n filter
★  megasquirt
★  atro
★  weapon r
★  injen intake
★  hondata s300
★  snow performance
  k&n cold air intake
  proefi
  aquamist
  volant
  motec
  power fc
  airaid
  injen cold air intake
  k&n intake
  injen intakes
  fujita
  autometer
  cq
  injen cai
  k n
  k&n air filters
  k&n air filter
  skunk2 cam gears
  unichip
  k n intake
  kn
  iceman
  k&n filters

Your alternative for aem is not listed? Suggest!
Speaking about aem, one probably shouldn't forget about racepak.

Other search terms related to aem and their ratings are:
★★★★★ racepak
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Google Trends

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