Ok, I just got a new DC Sports Header installed on my ls. Now there is a slight rattle coming from the catalytic converter and the car also sounds like there is an exhaust leak. Is the car suppose to sound like that with a header? The nuts on the supporting bracket for the secondary pipe broke off, so I just redrilled another hole on it. So now it has only 1 bolt holding it instead of 2. Could that be what's causing the rattle from the catalytic converer? Any opinons will be greatly appreciated. Thanks.