The best replacement for map sensor is maf sensor.

The best alternatives to map sensor are rated as following:
★★★★★  maf sensor
★★  maf
★★  afm
★  air flow meter
  throttle position sensor
  3 bar map sensor

Your alternative for map sensor is not listed? Suggest!
Speaking about map sensor, one probably shouldn't forget about nistune.

Other search terms related to map sensor and their ratings are:
★★★★★ nistune
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map sensor
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