In a medium bowl, mix together mayonnaise, sour cream, horseradish, pepperoncini peppers, pepper juice, black pepper, crushed red pepper, and garlic salt.
Add mayonnaise mixture to bowl with pasta along with remaining ingredients. Mix well. Cover with plastic wrap and refrigerate at least 2 hours. If desired, stir in 1/4 cup mayonnaise just before serving.
Use macaroni, baby farfalle, small shells, or corkscrew pasta.