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 Aero World�s Fastest (Again)Unearthed: 1985 Chevrolet Monte Carlo SS Its 5.5-liter twin-turbo V8 has been upgraded by 225 horsepower and 332 lb-ft of torque over the stock CLS63 AMG for a total of 775 hp and 848 lb-ft. The CLS63 AMG Stealth rockets from 0-62 mph in only 3.7 seconds and has a top speed of 217 mph. Along with a KW coilover suspension and 20" wheels, GSC added a unique front bumper with LED daytime running lights and redesigned hood. Out back there�s a four-pipe exhaust and a rear bumper that features a carbon-fiber diffuser and air outlets. Source: Carbuzz