Last question. Absolutely. Leaks don't just disappear. I think you have two unrelated problems here mate. You've established the exhaust issue. To try and establish the leak issue, take the car out, come home, then out some cardboard under the car where you think it leaking from. This should give you a better idea of where it's coming from and hopefully narrow the search area down slightly. Once you've determined a rough area, you can begin to look at it in more detail.