The best replacement for ram air is cold air.

The best alternatives to ram air are rated as following:
★★★★★  cold air
★★★★  cowl induction
★★★  cold air intake
★★  cai
  cold air induction
  cowl
  jlt cold air
  cowl hood
  intake
  open element

Your alternative for ram air is not listed? Suggest!
Speaking about ram air, one probably shouldn't forget about cold air intake.

Other search terms related to ram air and their ratings are:
★★★★★ cold air intake
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cowl induction