The best replacement for bov is bpv.

The best alternatives to bov are rated as following:
★★★★★  bpv
★★★★  wastegate
★★★  dv
★★★  no bov
★★  diverter valve
★  bypass valve
★  greddy bov
★  cbv
★  recirculation
★  bpv mazdaspeed
★  ewg
★  dump valve
★  recirculating
★  recirculating valve
★  external wastegate
  bpv mazdaspeed3
  bpo
  bpv wrx
  recirc
  bpv sti
  hks bov
  dv valve
  diverter
  flutter
  hks ssqv
  compressor surge
  tial
  atmosphere bov

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

Other search terms related to bov and their ratings are:
★★★★★ supercharger
★★ intercooler
★★ no turbo
★ turbo
out turbo
You have in mind a companion for bov and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bov in all years. Click on graph for more.
bov
bpv
wastegate