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First off, do you have an idea of what kind of car you want to purchase? Have you checked to see if any manufacturers you're interested in pulls EX? Are you a member of a CU? Have you checked where the previous posters above have confirmed EX is pulled?
Secondly, do you have any idea what amount you want to finance?
Ford Motor Credit and my local Ford dealer pulled Equifax here in NC this past summer, PenFed pulls Equifax, Bank of America online auto loan also pulled EQ.
Crap-One Auto loans pulled all three on me.
The FAA First CU pulls Experian for their credit checks, other than that CU, I do not know who pulls EX,