The best replacement for power vision is power commander.

The best alternatives to power vision are rated as following:
★★★★★  power commander
★★★★  tts
★★★★  vision
★★★★  pcv
★★★  sert
★★★  thundermax
★★★  super tuner
★★  race tuner
★  power commander v
★  vcast
★  tts mastertune
  pcs vision

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Speaking about power vision, one probably shouldn't forget about auto tune.

Other search terms related to power vision and their ratings are:
★★★★★ auto tune
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power vision
power commander
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