I'm using a couple of different things. I got exhaust tape that is high heat that I'm going to use to further secure the exhaust bandage. I also got the stainless steel zipties that I'm going to use to secure the exhaust wrap with and the adheasive spray they suggest.
As you can see from the pictures the right hand side is kind of difficult to access the lower perferated pipe but not impossible. I marked in red the areas I dremmeled so that you can see the cuts more easily. On the right side I made the opening smaller the the left after seeing that i really didn't need to make the whole so large.