For 2005, Mazda focuses on performance and luxury refinements within their seven-vehicle line-up. Power from the Mazda Tribute's four-cylinder engine is stronger for the 2005 model year. Side curtain airbags is offered as an option on the compact sport utility vehicle for 2005 while anti-lock braking system becomes a standard feature. The 2005 Mazda6 line-up features greater standard safety with the presence of anti-lock braking system and traction control on all models. A special edition SP23 version of the Mazda3 is part of the compact car's 2005 model availability equipped with leather seats and 17-inch polished alloy wheels. The rotary-powered Mazda RX-5 enters its second year on the market in the United States with the Shinka version. Black Cherry exterior color, 18-inch chrome wheels and improved suspension are qualities unique to the 2005 RX-8 Shinka.