The S204 inherited the concept of STI’s highly acclaimed previous model, the S203, known as a ‘globally pure sport sedan’, but with optimised driving performance, as well as revamped interior and exterior design. To give drivers the enjoyment of driving on any type of road around the world, STI performed repeated driving tests on test tracks, motorways and local roads in the UK and elsewhere. The chassis featured a new technological idea -a performance damper. As for the links, a large number of pillow ball bushes were fitted and the diameter of the stabilizer was expanded. Specially tuned dampers and low down springs were added, and lightweight BBS 18-inch forged aluminium wheels were combined with special Pirelli P ZERO tyres. Special Brembo brakes were also installed. As for the engine, pistons and connecting rods were screened by manual measurement of weight, one by one, while the crankshaft was also ground by hand to correct any imbalance in weight. The turbine size was increased, and a special 110-diameter titanium sport muffler was attached. As a result, improved power and response in acceleration was achieved, making the car seem lighter. This car featured special RECARO seats, in which extra attention was paid to both the frames and surface details of the material. The great driving feeling that only STI could deliver was offered with this model.