I have noticed that several cars (such as caddy's) have come with air suspension compressors/bags.  Anybody try to run bags off of these on your street rod?  Just thinking of an alternative to the standard install.  

I think it would be harder to convert from a stock car's then to buy one of the kits. Also the ones that come on luxury car's aren't really designed to do the same thing that ones on street rods use.