The Diamante's 24-valve V6 is bigger than most engines in the $30,000-sedan class, with a 3.5-liter displacement. Thanks to its large displacement, no variable valve-timing technology is needed to produce plenty of bottom-end torque. It delivers 205 horsepower at 5000 rpm, and a hefty 231 pound-feet of torque at 4000 rpm. This generous torque delivers vigorous throttle response, enough to propel the Diamante from 0 to 60 mph in just over 8 seconds. That makes the Diamante a quick sedan in this category.

Its acceleration performance is so vigorous that on wet pavement it will easily spin the front wheels. Leaving a standing start

in a hurry on a rainy day, you will see the little dashboard traction-control monitor light up regularly. The traction control is not overly quick to engage, which is a good thing. You have to truly slip the Diamante's tires before the light comes on, telling you you've activated traction control. A minutely delayed engagement of the traction control is preferable to having it constantly applying brakes on slippery surfaces when it is not needed. Overly rapid engagement of traction control can be intrusive, unnecessarily impeding your forward momentum, while simultaneously wasting fuel and brake-pad material. Some of the most prestigious luxury cars err in this manner. A switch on the dash allows the driver to turn off the traction control system when, for example, using snow chains.

Mitsubishi's traction control also includes what the company calls "trace control," which is a simplified yaw-stability system. Sensors compare steering-wheel angle to vehicle speed and a computer dials down engine power if the driver is in danger of exceeding the car's cornering grip.

Steering response is crisp and precise, thanks to the Diamante's well-calibrated power-assisted rack and pinion. Isolation from road irregularities is extremely good. At highway speed the noise level is pleasantly low, except for some wind noise at the driver's door. The LS model's high-performance 16-inch wheels and tires produce good roadholding and lateral stability. When pushed hard on back roads, however, the Diamante floats over undulating pavement and leans in hard corners. It does not offer the dynamic control of a firm European-style suspension, feeling more like an American sedan. Drivers who spend long hours on the freeway, however, will be pleased with the Diamante's suspension tuning and ride quality.