Here is mine:
dual piston aluminum front brake calipers, rear disks w/ Hawk HPS pads
5.3L w/ LS6 intake
f-body rear sway bar
poly bushings
tubbed wheel wells in the back
air bags with no tanks/pumps (adds weight)
battery relocated to the rear (weight distrobution)
gas tank relocated to the back (stock LS1 f-body tank with internal fuel pump)