The rear-wheel drive Boxster is offered in two trim levels: Base and S. The Base is powered by a larger 255-hp 2.9-liter flat six-cylinder engine for 2009, while the S boasts a 310-hp 3.4-liter flat six-cylinder engine with new direct fuel injection; both are mated to improved six-speed manual transmissions. New for 2009, Porsche's PDK seven-speed double-clutch gearbox, including manual shift mode and steering wheel paddles, replaces the former Tiptronic S transmission as an option. Boxster Base trims are equipped with 17-inch alloy wheels, leather seat trim, air conditioning, cruise control and a new CDR-30 audio system with MP3-compatible CD player; S trims add 18-inch alloy wheels and an upgraded sound system. Standard safety features on both trims include Porsche Stability Management (PSM), four-wheel anti-lock disc brakes with brake assist, front and side seat-mounted airbags with a curtain airbag for head protection, and fixed roll-over protection bars. New options for 2009 include a limited slip rear differential, Bi-Xenon headlights with dynamic cornering lights and LED daytime driving lights, ventilated seats, Bluetooth wireless connectivity and a universal audio interface that can control external audio sources such as an iPod or USB stick.The Porsche Boxster is revamped for 2009, entering its second generation with more powerful engines, new transmissions and revised styling, including modified front and rear fascias, a new headlamp design and LED rear lights.