Key Lime Margarita Pie

1 1/4 cups crushed pretezels
1/4 cup sugar
6 Tbsp butter, melted
1 can (14 oz) sweetened condensed milk
1/2 cup lime juice
1 env. KOOL-AID Lemon Lime Drink Mix
1 tub (8 oz) Cool Whip

Mix pretezels, sugar, and butter; press onto bottom and up side of 9-inch pie plate. Refridgerate until time to fill. Mix next 3 ingredients in large bowl. Whisk in 2 1/2 cups Cool Whip. Pour into crust. Freeze 6 hours. Remove from freezer 15 min before serving; let stand at room temperature until slightly softened. Top with remaining Cool Whip.

Special Extra: For stronger lime flavor, stir in 2 Tbsp. lime zest with the lime juice.