I think I have a leaky exhaust pipe on one side of my boat. I took off the SupraTrapps and have replaced with Fresh Air Exhaust. There is a Flange over the exhaust pipe and I think the exhaust pipe has a hairline crack in between the exhaust pipe and the transom of the boat. Is this typically the place where they are leaking? I have heard of swim platform leaks too but mine looks fine.... Any resources greatly appreciated. Thanks