Try their calculator. It allows you to take the shell off.

http://www.yum.com/nutrition/menu.asp?brandID_Abbr=5_TB

Assuming 2 normal tacos and 1 packet of sauce:

220 Cal
14g Fat
7g Sat Fat
50mg Cholesterol
750mg Sodium
6g Carbs
4g Dietary Fiber (So 2 NET Carbs)
2g Sugars
14g Protein
12% Vitamin A
8% Vitamin C
12% Calcium
12% Iron