Thanks a lot, Donay. Nicely put indeed.
In fact, the "ever" leave the question slightly different in kind.
Have you ever taken the SAT test? would mean "você já fez (algum dia/alguma vez) o SAT?"
and it would refer to one´s life span.
Whereas "Have you taken the SAT test?" would be a question to know, for example, to know if he has taken the test yesterday, last week, etc. One knows that the SAT test date was yesterday, last week etc, and want to know if somebody else took that exam.
It´s my opinion, though. I may or may not be mistaken, after all...