http://www.autoweek.com/cat_content...._code=02888267

"Look for Mercedes’ new 3.5-liter V6 and six-speed manual gearbox to debut on the 2005 SLK when the next-generation two-seater arrives this year. The dohc four-valve-per-cylinder engine should produce about 268 hp and 253 lb-ft of torque, which compares favorably to the current 3.2-liter, single-cam, three-valve V6 engine’s 215 hp and 229 lb-ft. The ’05 SLK will offer auto and manual gearboxes, including the new six-speed manual."