Well for me it was pretty simple. The easiest way to do it would be to get one of these
, doesn't have to be that one but a reciporcating saw. Then you will cut off the box. I reused the stock tip, so I had to cut that off as well. You can buy a new tip if you want but I didn't. It is really easy and only took me about 30mins. If you don't have one of the saw, it will take longer cause you will need to use a metal manual saw. With the resonator(lunchbox) gone, you will slide the flexpipe over the stock exhaust and clamp it. Make sure you buy the 2" flex pipe kit, that is the size that fits. If you need anything else, just ask.
And thanks for rep lol