new shocks/struts youll be set. there are many misconceptions about lowering springs vs coilovers etc, if you slam an a6 it's not going to handle as well as one dropped say 1.6-7 inches. the only cars that are real good to slam like that are civics, they have double wishbone suspension. as far as i know thats the deal with that, youre handling is going to improve dramatically with the lowering springs, and if you get a nice thick sway bar in the rear youll really be good to go.