I believe that the sport GT-S already has a performance x-pipe. However the ECM and DBWEM will be a solid upgrade on the car.Jeff,
I will be taking in a sport GT-S this wed. After so many months of waiting the car will finally be here!
I was wondering the x pipes, ecm an DBWEM would make any difference on this particular model?
For now, Auto Couture has a body kit for the QP, IMO, its not pretty. http://www.auto-couture.com/maserati/quattroporte/index.html