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In a medium sized bowl, combine mayonnaise, sour cream, garlic, cotija cheese, chili powder, and cilantro and set aside.
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Heat gas grill to high.
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Remove all but the inner layer of corn husk.
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Grill corn with inner layer of husks still on for about 15 minutes, or until heated through.
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Remove corn from grill and carefully remove husks.
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Grill for an additional 5 minutes to pick up char on the corn.
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Remove corn from grill and spoon cheese mixture over hot ears of corn.
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Squeeze fresh lime juice over corn and sprinkle with additional cheese, chili powder and chopped cilantro.