HAS means it's not a true dual setup.

 

Thanks for the replies! Living here in Northern Va./Washington, D.C. area, we do have the potential for rough weather. This coupled with the fact that I will most likely keep this truck for the next 10 to 12+ years, I felt it was worth the price to go stainless all the way around. I know no one will look underneath. I just wanted a system that I would not have to worry about for quite some time.

 

Exactly. Here in canada we have snow and salt and rocks on the road in the winter so its good to go with stainless.