I went to the muffler shop the other day to get my Dynomax installed. These are the same that ROZ has but I let the shop owner talk me out of it. I had the truck up on the lift and decided it was going to be way to load.I may unflange the tail section and stick them on the catless mids when I have time. On a good note I found out that the muffler guy live just down the street from me. He also does inspections and told me he would inspect my truck with the catless in when it is due. We need some sounds clips asap.