The first thing you notice about the SLK 320 after the new interior decor is that wonderful new sound when the engine starts. Mercedes designed the exhaust system to give the V6 version a distinctive, throaty exhaust note that adds measurably to the fun of driving the car without being too loud.The new 6-speed manual transmission is far, far superior in shifting ease and feel to the old 5-speed manual, with the added bonus of one more gear for much quieter, smoother and easier highway cruising. The transmission is almost perfectly suited to the power and torque characteristics of the engine, and we would recommend it over the automatic for sheer driving fun. The automatic is no slouch in this department, however; the automatic's TouchShift manual shifting mode is very quick and precise.
The SLK 320 is terrific fun to drive, in part because it is short and relatively light and now has a lot of power and lots of gears to choose. While the SLK 230 is a sporty car, the SLK 320 is a sports car. The supercharged 4-cylinder engine in the SLK 230 runs out of steam pretty early, but the V6 just keeps going, and sounds less labored doing it.
In either case, you get anti-lock brakes with Mercedes' Electronic Brake Assist, traction control, and Electronic Stability Program, all of which will keep a driver out of trouble in wet, snowy or muddy conditions or when cornering at very high speeds on dry pavement. (Experienced drivers can switch ESP off for autocross and racetrack events, but all other systems are constant.)