Boil macaroni in salted water according to the box instructions, until al dente. Drain and rinse with cold water to stop the cooking process
In a bowl add mayo, sour cream, yellow mustard, Dijon mustard, apple cider vinegar, relish, sugar, garlic powder, onion powder, celery salt, black pepper, and seasoning salt. Mix together and set dressing aside
In a separate large bowl add the cooled pasta, red bell pepper, green bell pepper, red onion, and celery. Add 1 cup of your dressing, stir in to make sure everything is well coated, and place in the refrigerator for at least an hour to chill. Reserve remaining dressing on the side to mix in later. This will help to keep your salad from drying out.
Before serving, mix in the remaining dressing and stir again to make sure everything is well coated.