Would the Eibach Pro Kit be ok to put on a stock Cobalt? Or would the ride quality suck? And would the stock struts be able to support the springs without causing any problems in the future?

it would be alright, but i think the sportline is more suited for your tastes
the struts should be fine as long as you get it properly aligned

I honestly doubt you will get many miles out of the stock struts and shocks once you lower it. I learned my lesson the hard way on my old 01 Z24.. unless gm has changed up the quality I doubt it will last long

Check out this post first (http://www.cobaltss.net/forums/showthread.php?t=1944)

Just read the whole thing its not that long.
Please do yourself a favor and upgrade your struts. OEM struts can only handle lowering springs for a short while. Just save some money and upgrade the struts.

so are they out yet?

is what out yet??? koni is waiting for my car

I emailed them the otherday and they told me late this year early next year

I emailed them the otherday and they told me late this year early next year

Koni has the kit already, they just can't release it till they have my car for final fit and performance. I'll let everyone know how they are and what the specs are on them. As I posted in another thread I'll work on Koni to get them to set up a GP