U.S-spec X3 models were well-equipped, with standard equipment such as: the BMW Business A/M-F/M-CD radio (with optional dealer-activated Bluetooth functionality for wireless phones), an eight-speaker premium audio system, leatherette-trimmed seating surfaces, dual power front bucket seats, aluminum interior trim accents, keyless entry, and seventeen-inch (17") aluminum-alloy wheels. Optional equipment included a ten-speaker premium audio system with Digital Sound Processing (DSP), Sirius Satellite Radio, a dashboard-mounted color GPS navigational system that replaced the upper dashboard storage compartment and contained a modified version of BMW's "iDrive" multimedia system, eighteen-inch (and later nineteen-inch) aluminum-alloy wheels, Nevada leather-trimmed seating surfaces, heated front and rear seats, a heated steering wheel, a security system, BMW Assist, a panoramic dual-pane moonroof, Xenon front headlamps with adaptive front headlamps, and sport front bucket seats.