Rocco

I have a 1990 formula 350 and the exhaust is all original and its leaking in a few spots time to change. My question is i have a weird clap holding the intermediate pipe and the Y pipe together. Its a circle clamp with one bolt that holds the two lips of the pipes together . The cat backs I have seen look like they have a 2 bolt flange type. I want to get a cat back i can bolt on myself and when i change my cats and Y i would like it all to fit. I don't want to change anything that i might have to change again. So should i have a muffler shop install it and weld a different connection to the Y ,or is there a cat back that will fit this type of connection. If there is can i get a Y to match up latter.