The R33 Skyline was introduced in August 1993. Slightly heavier than the R32, it was available in coupe and sedan body configurations. The R33 was the safest of the models with a rating of 3.8 out of 5.5 accordingly; the airbag system and internal crash bars made this vehicle significantly safer than previous models. All models now used a six-cylinder engine. Nissan took the unusual step of down-grading the GTS model to have only the "RB20E", while the twin-cam of the R32 GTS was discontinued. The 2.0 L turbo "RB20DET" GTS-t was also discontinued and was replaced with the GTS-25t which was equipped with the larger RB25DET and featured HICAS as standard in all GTS-25t sub-models except the Type G.