Looking to upgrade your already expensive Euro-built performance car? The guys over at GSC are here to help. German and Italian-built performance cars are often the main focus of attention for aftermarket tuning firms � and for good reason. In fact, there are many good reasons why these companies like to lend their hands to upgrading the performance and overall specs of some of the world�s best-engineered cars. German Special Customs, also known as GSC, has been building itself quite a reputation for transforming already fantastic cars by not only upping their performance but also in giving them a dose of sharp, not overly overdone styling kits. Here are five examples. more at CarBuzz: Harris Drives SLS Electric DriveUltimate...