Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooled pasta, corn, cherry tomatoes, red onion, cilantro, and feta cheese.
In a separate bowl, whisk together the mayonnaise, sour cream, lime juice, chili powder, garlic powder, salt, and pepper until smooth.
Pour the dressing over the pasta mixture and toss until everything is well coated.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Taste and adjust seasoning if necessary before serving.