2009 Audi A6 3.0T quattro Sedan

Try splitting a market segment. That is, encapsulate the positives of both ends with none of the negatives. The Audi A6 does it deftly, bridging the space between the midsize A4 and full-size A8. Naturally, it shares engines with both, a 3.2L V-6 and a 4.2L V-8. But for 2009, it receives something in between: Audi's new supercharged 3.0L V-6.

Underhood the 2009 Audi A6 3.0T, the supercharger provides 11.6psi maximum boost to produce 300 hp and 310 lb-ft of torque. Max torque is available from 2500 rpm to 5100 rpm, where max horsepower starts and stays until the 6800 rpm redline. The result is eyebrow-raising acceleration as you pull the six-speed automatic's paddle shifters and watch as the digital speedometer slot-machines into triple digits. And that seat-of-the-pants sensation translates to the hard data: Acceleration to 60 mph takes 5.4 sec, just a tenth off the pace of the outgoing Nissan 350Z Track. Sure, the Z reaches the quarter-mile mark a little over a tenth faster, but this A6 is an inconspicuous, all-wheel-drive, 4139-lb sedan.

Audi is keen on that unassuming nature. The Roots-type blower sits concealed between the cylinder banks of the V-6. Hood popped, there's no indication of a power adder - save for the "TFSI" misnomer. There's no belt whine at speed, either. The engine fires in silenced, but powerful blasts. It's quiet and deceivingly quick -- a good combination for, say, a spy.

But this same sensation led to a minor disappointment when an iPod cable fell from the glovebox instead of trick spy gadgetry. While not effective at discouraging pursuers, the cable does integrate playlists and functions nicely with Audi's MultiMedia Interface infotainment system. Images displayed on screen flip around and minimize in a stylish fashion, and the system handles navigation and HVAC controls well. Version 2.0, set to arrive in the A6 later this year, promises faster processing and higher resolution.