Pour some rimming salt onto a plate. Rub the rim of a margarita glass with the lime wedge and dip in the salt to coat to taste. Garnish glass with lime wedge and mango pieces. Fill glass half way with ice. In a cocktail shaker, smash the mango to release its juices. Add the Sauza Tequila, Grand Marnier, Sauza Margarita mix, and fill the rest with ice. Shake and strain into your rimmed glass. Enjoy and repeat!