Redesigned for 2003, this 2-seat convertible has new styling, more high-tech features, and a retractable metal hardtop instead of a cloth folding top. It's slightly larger than the 1990-2002 model, yet some 125 lb lighter. The SL500 retains a 302-hp 5.0-liter V8. The new high-performance SL55 AMG has a 493-hp supercharged 5.4 V8. A 5-speed automatic with a manual-shift gate is the only transmission, though the SL55's "SpeedShift" unit gets performance programming and steering-wheel shift buttons. Both models have Mercedes' ABC active suspension designed to reduce cornering lean, plus an antiskid/traction-control system. The antilock 4-wheel disc brakes' "brake-by-wire" technology modulates pressure to each wheel. Head/torso side airbags, driver knee airbag, and a rollover bar that pops up if sensors detect an impending tip are standard. So are navigation and assistance systems, and a second battery, mounted in the trunk, to run power accessories. The SL500 comes with 17-inch wheels. Standard on the SL55 and optional on the SL500 are 18s with higher-speed low-profile tires. Options include bi-xenon headlamps and ventilated and massaging seats. Also available is Mercedes' Distronic cruise control designed to maintain a set following distance and its Keyless Go credit-card-sized transmitter for unlocking and starting the car simply by touch. Voice control for audio, phone, and other functions is a dealer option.