Dear God, whatever you do don't go to Midas or Menekie and ask them to touch an offroad mid or anything to do with the converters unless it is replacing them!!!
Forget going to the Franchise type muffler places, they will rape you.
Go to a local trusted muffler shop. They charged me $100. to install mine.
Its way easier when you can stand up under the car, Well worth it to me.
Most shops won't touch removing your good converters and replacing them with an OR pipe. In fact it is illegal in most states. Buy a jack and stands, replace it yourself, sell your old convertes at the scrap yard. I got 200 for mine.
If you live near me bring it to my house and I'll do it for a paid lunch.