What's this mean? Seen many people say to do it? What does it do and how do i do it?

 

Pretty much you knock out all the filtering ceramic layers out of the cat and leave it hollow. I wouldn't recommend it myself, but others may have a different opinion.

 

Basically you unbolt the cat and then jam a pipe or broom handle of some sort into the cat. You break off the pieces that are inside the cat for emission and turn it into basically a free flowing pipe. After you break all the pieces inside the pipe you then start the car and blow all the crap out.

I would just suggest in getting an offroad pipe made inplace of you car. Any muffler shop should be able to make you one.