Originally Posted by 1998 ford ranger 5speed
cai can increse horse power if they are set up right if they are under the hood they hurt more than help but if you put them in the finder whel they will give you about 5hp not much and they cost like 60 bucks for that so in my mind its not worth it very much to me
Independent dyno tests say this is not true for newer vehicles.
Anecdotal stories from users say they do increase performance, but like the Easter Bunny, actual proof of it "working" remains undocumented.
Older vehicles with carbs sucked in warmer engine bay air, this is where the Cold Air Intakes first started to be used and they did help for sure.
With fuel injected engines manufacturers simply added CAIs for better MPG and performance.
If you look at where the intake air comes from on most(all) newer vehicles you will see it is coming from in front of the rad support, which will be about as cold as the outside temp will allow, and no, radiator and AC doesn't heat that air if you are driving above 5mph, lol, at idle maybe, but not when moving.
Nothing wrong with the looks and sound of CAIs, but performance will not change if done properly, it will drop if done improperly.