It is difficult to have a clear answer to the question "Which horse intestines are the most authentic in Yili", because many people think their horse intestines are authentic. However, I can give you some suggestions to help you find the horse intestines that best suit your taste.

First of all, you can choose to buy horse intestines at the local farmers' market or specialty food store. When choosing, you can ask the seller about the production technology and raw materials of horse intestines, as well as their production experience and reputation.

Secondly, you can try different production techniques and tastes. For example, some horse intestines may be smoked, while others may be cured or baked. Different techniques and tastes may bring different tastes and flavors, so you can try several different horse intestines to find the one that suits your taste best.

Finally, you can also consider consulting local Kazakhs or experienced horse intestines producers. They may give you some more specific suggestions and guidance to help you find the most authentic Ili horse intestines.

In short, finding the most authentic Ili horse intestines requires your own taste and judgment. I hope these suggestions can help you find the horse intestines that best suit your taste.