Cook the rotini pasta according to package instructions; drain and cool.
In a skillet, sauté the corn until slightly charred, about 5 minutes.
In a large bowl, combine the cooled pasta, corn, red bell pepper, red onion, and cilantro.
In a separate bowl, mix the mayonnaise, sour cream, lime juice, chili powder, salt, and pepper.
Pour the dressing over the pasta mixture and toss well to combine.
Adjust seasoning if necessary.
Chill in the refrigerator for at least 30 minutes.
Before serving, give the salad a good stir.
Garnish with additional cilantro and lime wedges if desired.
Serve cold and enjoy!