After driving for a while, the water pump gasket was holding up, but there was another leak in the system, and also a leak in the heater core. The leaks weren't as bad as the water pump, but because of the extra heat, it made it worse. I ended up going through the system and making sure everything was cleaned and sealed properly.
While I had everything apart, I changed some things around and relocated the thermostat housing.
While things were apart, curiosity got the better of me and decided to check out the exhaust. Can see where the O2 sensor was sitting in the GN manifold.
Then came all the issues I hadn't noticed. It looked like it had started to leak from where the O2 sensor was sitting.
Then looking under that, there was a big issue. Like where has the catalytic convert gone? The GN came with the a cat converter, but looks like mine is missing. It could have been removed by a previous owner, or could have just disintegrated over time.
Looks like the gasket between the top and bottom parts of the exhaust has been leaking too.
Not surprising when looking at the gasket.
Instead of putting the leaky exhaust back on, I am putting a non leaky exhaust on.
![Image](http://i620.photobucket.com/albums/tt288/Cottees/Sigma/IMG_8442_zps3yjl7xrs.jpg)