I recently purchased a 2015 ATS 2.0 luxury sedan. I am impressed with the car's over all performance, but am looking to enhance it. I replaced my aging 2004 E46 M3, hated to, but the car was very tired. I was looking at the stage 1 and e85 stuff from ZZP? any opinions? also the car is a bit softer than I would like in the sport setting, has anyone her used the eibach pro kit springs?