Recently purchased 2003 C4S (still have 1978 SC Targa) and just installed Eibach lowering springs. I was told that Porsche(Phaff) is the only one who can do a proper alignment on this car. That there is special tooling from Porsche necessary to do a proper job. Is this correct or was someone just blowing smoke up my butt. Obviously I want a proper job done but want to know for my own sake.