if you are talking about the thing that looks like "braided line" then you would be looking at the "flex pipe". it is there to let the engine move without disturbing the exhaust piping(too much). if it was not there then while you were driving and steped on the brakes or are accelerating from a stop then your entire exhaust would "rock" back and forth with the engine and you would eventually have a leaking exhaust donut or exhaust manifold.
Oh, I see. Answers my question just fine. So it goes after the headers? Then to the cat (if you have one)? So when I upgrade to Hotshot and get random cat, I'll need to weld on a flex pipe in-between? Thanks