i dont like lifted 2wd trucks it defeats the purpose and its just for looks...Like they said, it will hurt your gas mileage.
BUT, they have front coilspacers too im not sure how the new chevys are set up tho..And yes you will need new shocks for even the 3". Im not sure on what kits your lookin at but i would imagine all of this is close to a grand. Save up a lil more and you could straight axel it and actually be 4x4 along with the abillity to go from 6" to 30"....