The best replacement for horn is antler.

The best alternatives to horn are rated as following:
★★★★★  antler
★★  liddell
★★  french horn
★★  trumpet
★★  chuck liddell
★  tweeter
★  hatteras
★  torti
★  frank shamrock
★  olin
★  dome tweeters
★  cod
  josh burkman
  dome tweeter
  oboe
  longview
  tuba
  rowlett
  waveguide
  court mcgee
  front loaded
  cruise control
  antlers
  dorsal horn
  folded horn
  lisa torti
  euphonium
  mellophone
  bass reflex
  tusk
  matt lindland
  copperas cove
  dean lister
  siren
  english horn
  laramie
  kapfenberg
  city of ladue
  double horn

Your alternative for horn is not listed? Suggest!
Speaking about horn, one probably shouldn't forget about quick release.

Other search terms related to horn and their ratings are:
★★★★★ quick release
★★★★ strobe
★★★★ strobe light
★★ bragging
★ aftermarket steering wheel
You have in mind a companion for horn and it is not yet here? Propose!



Google Trends

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horn
antler
liddell