I put on the SR. It'll take a day if you do it yourself. You don't need CCPs or shocks because with the SRs it isn't a big enough drop to put it out of alignment. Yes it would be good to get the CCPs and shocks at the same time but you'll be fine without them. Mine doesn't scrap anywhere and it got rid of most of that huge ugly gap with the stock springs.
1999 V6 Mustang Dark Satin Green , SR CAI, BBK 65mm Throttle Body, Screaming Demon Coil Pack, SR Lowering Springs, Pioneer Stereo, 2 12' inch subs and 1600watt amp, Green Calipers,