Cook the elbow macaroni according to package instructions. Drain and rinse under cold water to cool. Set aside.
In a large mixing bowl, combine the corn, red bell pepper, 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.
Add the cooled macaroni to the vegetable mixture and pour the dressing over the top. Gently toss until everything is well combined.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a gentle stir and adjust seasoning if necessary.