I only have a single stock exhaust. What do I need to do in order to get a cat back going?

 

first off you need to get dual exhaust. just take your car to the local muffler shop and tell them you want a dual cat back exhaust. this will run you around 2-400 bucks possibly less if you buy the mufflers before hand. i dont really know cause i live in canada and a dual exhaust set up would cost me around 300. i would also try and go true dual, dont mess with the x or h pipe