Fill 3-quart saucepan 2/3 full of water; heat to boiling. Add Pasta. Gently boil, uncovered, 12 minutes, stirring occasionally; drain. Rinse with cold water to cool; drain well.
In large bowl, combine Seasoning mix from packet, lime juice, vegetable oil, sesame oil, water, sugar, soy sauce and red pepper flakes with whisk. Add shrimp, bell pepper, mango, green onions, cilantro and sesame seed. Toss until well combined. Stir in cooked pasta. Cover and refrigerate until ready to serve.