Cook the rotini pasta according to package instructions. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked pasta, corn, cherry tomatoes, red onion, feta cheese, and cilantro.
In a separate small 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 gently until everything is well coated.
Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a good stir and adjust seasoning if necessary.