You'll notice a big difference with aftermarket shocks b/c they're stiffer than stock. Plus, you'll save $ on install if you have your shocks/springs put on at the same time. I drove with stock shocks w/Neuspeed sports for a yr and my car was bouncing like a low-rider in a Dr Dre video. I then had Tokico blues installed it solved that issue. Like the others were saying, don't forget about the alignment; you may need camber kits too. GL!