Cook the elbow macaroni according to package instructions. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked macaroni, sweet corn, cherry tomatoes, red onion, feta cheese, and cilantro.
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 evenly 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.