Bring a large pot of water to a boil & cook pasta to al dente. Drain & rinse with cold water.
In a large bowl, mix together the mayonnaise, vinegar, sugar, mustard, salt, pepper, onion, celery, green pepper, carrot and pimentos.
Add the pasta once cooked & mix until well coated.
Refrigerate for at least 4 hours before serving, but overnight is best.
Once chilled, stir and garnish with extra carrots or celery (optional). Enjoy!