In a large saucepan bring water and salt to boiling. Add lobster tails. Return to boiling; reduce heat. Simmer, uncovered, for 6 to 10 minutes or till lobster shells turn bright red and meat is tender. Drain. Cover and chill for 2 to 24 hours.
For sauce, in a small mixing bowl stir together mayonnaise or salad dressing, sour cream, parsley, lime juice, curry powder, and hot pepper sauce. Cover and chill till serving time.
To serve, place one lobster tail, shell side down, on each serving plate. With scissors, cut the lobster lengthwise. Serve with the sauce.