I want to invest in a good exhaust, but for now I just want to go cat back. Can I buy a turbo back kit and just install it from the cat back or will that not work? What about if I bought a cat back, later on could I buy the pipe to get rid of the cat?

Looking at a Magnaflow 5" kit.

thats what i did. I bought a mbrp cat back kit when i first got the truck and just 3 days ago i put the front pipe or turbo pipe on to delete the cat