in the 1500 series added flex-fuel capability. The 6.0-liter engine was not available in the 1500 series. For 2003, all GM full-size trucks received an upgraded interior, with better-quality materials and other enhancements. New radios offered Radio Data System compatibility, XM satellite radio, Bose sound and improved ergonomics. Adjustable pedals were added as an option, and the instrument cluster-mounted Driver Information Center was improved and monitored up to 34 vehicle functions. A Panasonic DVD system was added as an option. GM's Stabilitrak system was added, and Quadrasteer became available on 2500 series Suburbans. Towing capacity for Quadrasteer-equipped vehicles was reduced by (the weight of the system). For 2004, 1500-series Suburbans received the Hydroboost braking system that was previously introduced in the 2500 series. The Mexican-market Suburban received a front end update this year, matching that of the Silverado. The 2005 model year saw the long-standard side-hinged panel doors discontinued in favor of the formerly optional liftgate. All engines switched to an all-electric cooling system to reduce power loss and fuel consumption. The Z71 package, long exclusive to 4WD models, became available on 2WD Suburbans. OnStar also became standard across the board. Finally, Stabilitrak became standard on all models shortly after the start of the model year. the 2005 Suburban 1500 won the J.D. Power and Associates award for highest initial quality among large SUVs, beating out its rivals the Ford Expedition and Toyota Sequoia. For 2006, the GMT800 Suburban's last year, a special LTZ trim package became available, featuring wheels, all-wheel drive, and the LQ4 6.0 L engine of the 2500 series of trucks and SUVs. The catalytic converters were relocated closer to the engine. The XM radio antenna and the OnStar antenna were combined into a single unit. Engines Vortec 5300 V8 (00), (01-03), (03-06) at 5200 rpm and of torque at 4000 rpm. Vortec 6000 V8 ( at 5200 rpm and of torque at 4000 rpm). Vortec 8100 V8 (325 hp at 4200 rpm and of torque at 3200 rpm). Vortec 5700 V8 remained in use in 2002-00 Suburbans, Tahoes (called Sonora) as well as Silverado pickup trucks in the Mexican market Tenth generation (2007) The 2007 model year Suburban and Yukon XL were unveiled at the 2006 Los Angeles Auto Show in January. Production of the redesigned GMT900 Suburban and Yukon XL began at Janesville Assembly and Silao Assembly in January 2006 (Suburban) April 2006 (Yukon XL),