The best replacement for hpdi is four stroke.

The best alternatives to hpdi are rated as following:
★★★★★  four stroke
★★★★  mercury optimax
★★★★  optimax
★★★  4 stroke
★★★  four stroke yamaha
★★★  pro xs
★★  etec
★★  vmax
★★  ox66
★  evinrude etec
★  e-tec
  4-stroke
  mercury 200 optimax
  mercury 175 optimax

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hpdi
four stroke
mercury optimax