The 2006 Ford Explorer is a part of the SUV's fourth generation, a full-size, traditional SUV available in XLS, XLT, Eddie Bauer and Limited trims, with 7-passenger seating offered in all but the XSLS. Engine choices include a 210-hp, 4.0-liter V6 and a 292-hp, 4.6-liter V8, coupled to a five-speed automatic transmission as standard, with a six-speed-automatic unique to Ford available for V8 models. Both rear-wheel and four-wheel drive systems are optional across all trim levels. For entertainment and connectivity, MP3 audio input and CD audio system come as standard, while touchscreen infotainment system with navigation is an optional add-on. Key safety features include optional stability control, tire pressure monitoring system and adaptive cruise control. The 2006 Explorer received significant updates over prior models, including a redesigned frame, improved handling and a quieter, more refined interior.