I believe colder air is more dense. If the intercooler is able to cool the air more than stock, it will be more dense, so there will be more air in the same volume, so more boom.what does a FMIC Do for 0-60 time tho? Other than allowing for more consistent/repeatable results I guess.
EDIT: If that sounds like I was being a ****, I didn't mean it that way at all. Just that if the IC can cool the air temps lower than the stock can, you would have improved 0 to 60. It seems like the IC would depend on conditions though; for example, if it were 100 outside an IC might make much more impact than if it were 30.