4S, 4S Diesel and flagship Turbo available from launch. In March 2017, Porsche unveiled the Panamera Turbo S E-Hybrid, a plug-in hybrid for the 2018 model year. The Turbo S E-Hybrid will receive the 4.0 L V8 engine from the Panamera Turbo, but will also be paired with an electric motor. Total system power will be , which makes it the third most powerful Porsche ever, after the 918 Spyder and 991 GT2RS. In August 2017, Panamera 4S Diesel and Panamera Sport Turismo 4S Diesel were deleted from Porsche's German website and configurator. The German automotive magazine, Auto motor und sport, discovered the higher than permittable amount, which is one-and-half times more than legal limit, during the exhaust testing. The issue was with SCR catalysator and urea injection. In September 2018 Porsche announced that the company had decided to no longer offer diesel propulsion in future. Exterior design The second-gen Panamera no longer has its predecessor's oft-criticized hatchback wagon styling, with the tail of the new vehicle developing a clear link to the Porsche 911 through the full width rear LED light bar, and the sharply creased tail and upper bumper. This improvement in design has helped clarify the model's identity as a sports-oriented GT car. Sport Turismo In Europe a 5-door, shooting-brake estate variant, called the Sport Turismo, will be offered alongside the liftback/fastback saloon. It will also be available in the United States. The Panamera Sport Turismo debuted in March 2017 at the Geneva Motor Show, and is currently available with the same engine range as the 4-door car. In September 2017 Porsche announced the Panamera Turbo S E-Hybrid Sport Turismo, the 5-door estate version of the flagship Turbo S E-Hybrid, which had previously only been available as a 4-door configuration. As of September 2017, the Panamera Turbo S E-Hybrid Sport Turismo is currently the world's most powerful stock estate car, besting the Mercedes-AMG E 63 S and the Audi RS6 Performance. Engines Performance Reception Despite the differences in dimensions and design, a reviewer noted that the Panamera's driving dynamics were close to that of the 911, and it "seems to occupy the no-man's-land between really good sports sedans and proper sports cars", and so far the Panamera has won some comparison tests against other four-door performance cars on the market such as the Maserati Quattroporte and Aston Martin Rapide. Function was also praised, with the hatchback trunk,