The new 911 generation is introduced in Autumn 1988, but the convertible is not launched until the model year 1990. Alterations to the body include the bumpers and sill tread plates, and the 911 continues to be equipped with an automatically retractable rear spoiler and a cowled underbody. The braking system is fitted with ABS. The 911 (Type 964) also features power-assisted steering for the first time.– Porsche