I'm looking to go bigger this fall/winter and will need to redo my suspension. I'm looking at a lot of weight (4 BTL 15s walled, 3-5 D3100s in the trunk, 2 Sundown 3500s, etc...) I'm pushing the limits already with my current setup, so I'll have to take care of this before the build starts.
I put up posts on Impala forums and basically got laughed at and most everybody said to just "get a truck". Nobody could really help. I don't really want to spend 2+ grand on a full air ride system, but I will put down some cash for something decent.
The only thing I've really found is this:
http://www.wbodystore.com/grandprix/Rear-Heightening-Springs-p-304.html#
But not sure if they would be the way to go. I need all the help I can get!