The best replacement for cai is sri.

The best alternatives to cai are rated as following:
★★★★★  sri
★★★★  short ram
★★  wai
★★  ram air
★★  short ram intake
★  rai
★  drop in filter
★  sri mazdaspeed3
★  injen cai
  v2
  air filter
  caci
  stock air box
  jiu
  sri mazdaspeed 3
  stock intake
  k&n cai
  computer aided instructions
  computer aided instruction
  vicky cai
  aem cai
  computer assisted instruction
  drop-in k&n
  hai
  aem v2

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

Other search terms related to cai and their ratings are:
★★★★★ tune
You have in mind a companion for cai and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cai in all years. Click on graph for more.
cai
sri
short ram