Never grew cowhorn. I heard they were not hot so maybe yours came out as a hybrid or maybe the plant was stressed and produced hotter pods.

Got a picture?

My grandparents grew them, I remember getting a hot one every now and then.
Randal

Here's an 11 inch pod on the plant.

Here's the plant.

Wow nice pod! Plant looks good and healthy to. Good job!
Randal

Looks like a cayenne to me. Like a Joe's Long.

I looked those up, but these appear to be much thicker than those. However the heat level doesn't match what a cowhorn should be. This is a bonnie plants "cowhorn pepper" and it does match what they have on their website as far as appearance. So who knows, could be a cross or my growing conditions could have made it hotter than normal, or it could have been mislabeled. Either way they are very tasty!