The best replacement for s300 is x100.

The best alternatives to s300 are rated as following:
★★★★★  x100
★★★★  project x
★★★  s400
★★★  kbs tour
★★★  r300
★★  project x 6.0
★★  patriot
★  project x 5.5
★  pxi
★  r300 shaft
★  s200
★  project x 6.0 flighted
★  kbs tour stiff
★  pxi 6.0
★  kbs
★  neptune
★  bdp s1
★  s400 tour issue
★  rifle 6.0
★  bdp s301
★  h200
  px 5.5
  rifle shafts
  x100 shafts
  6.0
  s1300 fujitsu
  apex 4
  bdp s350
  c taper
  kbs90
  s300u

Your alternative for s300 is not listed? Suggest!
Speaking about s300, one probably shouldn't forget about p28.

Other search terms related to s300 and their ratings are:
★★★★★ p28
★★★★ ecu
★★ p28 ecu
★ aem wideband
★ hondata
You have in mind a companion for s300 and it is not yet here? Propose!



Google Trends

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s300
x100
project x