Just finished installing the engine oil cooler, and the headers. The oil cooler takes quite a bit of time, most of it to ensure everything is done properly (since it is critical in this project).
I wrote a long how-to here:
http://www.camaro5.com/forums/showthread.php?t=381050
I also replaced the diff fluid while it was easier to get to (since the muffler is out). As expected, the fluid looked very dirty, and both fill and drain plugs were completely swamped with metal soup. I always see this kind of stuff from the first change, so I think most of this is due to break-in.
This is supposedly diff oil:

Magnetic plugs completely covered with stuff.

When it's clean:
One thing that upset me is the O2 sensor locations of the Texas Speed headers. It is pretty much getting most of the readings from only one of the cylinders:
The steering column's booth is pretty close, but is not touching. Do I need to remove it?
Weight:
OEM header 23.6 lbs
TSP LT + Cat = 20.8 lbs