exhaust problem

i have a 2001 GTI with a large exhaust leak inside the engine compartment. Where can it be coming from, it fills it up in seconds. Where an it be coming from?

I have a 1997 GTI that has leaking water out of one of the exhaust pipe plugs and depositing water in the hull. I will be fixing it with JB Weld over the weekend. My question is "would an exhaust water leak cause performance problems"? Background: This spring, I rebuilt the carbs...