X2
Find a 'Mom & Pop' muffler shop in your area that can & will work with you to install the right components. Do not go to a 'Box' store muffler shop that will only install what their computer tells them to.
The exhaust is all welded together so unless you're set up for that kind of work, you'll have to take it in for a shop to do it for you. It's not a 'shade tree mechanic' type job.