The best replacement for buttkicker is aura.

The best alternatives to buttkicker are rated as following:
★★★★★  aura
★★  bass shaker
★  clark synthesis
★  aura shaker
  crowson

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

Other search terms related to buttkicker and their ratings are:
★★★★★ playseat
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Google Trends

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buttkicker
aura
bass shaker