Preheat grill for high heat. Brush 6 ears fresh corn on the cob with Vegetable oil. Grill corn, turning every 2-3 minutes, until slightly charred on all sides. Cool and cut corn kernels off cob.
In a medium bowl, combine corn kernels, 2-3 tablespoons mayonnaise, 2-3 tablespoons sour cream,1 tablespoon lime juice, 1 teaspoon chili powder and Dash of cayenne pepper. Season with Salt and pepper, to taste. Garnish with ¼ cup crumbled queso fresco and ¼ cup chopped fresh cilantro.
