The smaller of Mercedes-Benz's two-seat convertibles is unchanged for 2007. Like the larger, costlier SL, the SLK has a power-folding hardtop. It comes in three versions. The SLK280 has a 228-hp 3.0-liter V6. The SLK350 has a 268-hp 3.5-liter V6, and the SLK55 has a 355-hp V8. SLK280 and 350 offer a 6-speed manual transmission or 7-speed automatic. SLK55 comes only with the automatic. All have ABS and traction/antiskid control. Also standard are knee airbags and side airbags designed to protect head and torso; they also include rollover deployment. A Sport Package for SLK280 and 350 includes firmer suspension, specific wheels and tires, body trim, and steering wheel shift buttons for the automatic transmission. Optional on all is Mercedes' Airscarf feature that delivers heated air through neck-level vents in the seatbacks.