I like how tirerack puts the weight of the wheel on their page. I noticed the wheels in OP are about 5 pounds heavier than some of the others. 5 pounds per corner is a big deal.
Does anyone know what stock ZL1 wheels weigh?
Edit: it looks like the fronts are ~27lbs and the rears are ~28lbs.
http://www.camaro5.com/forums/showthread.php?t=219198