If i go with a o/r x-pipe what is it called that makes it so the o2 sensors still act like there working and where do i purchase them and how much does it ruffly cost?
They are called either "MIL Eliminators" or "Simulators." There are a few different options out there on the market to "disable" your rear O2 sensors for the lack of cats (ie - plug in, splice/wire in, homemade, or via a computer chip).
I personally like the Pony Express Performance MIL Elims: