From Acura press: With athletic and emotional styling, powerful engine performance and a new Super Handling All-Wheel Drive™ (SH-AWD®) model, the all-new fourth-generation 2009 TL is nothing less than the most exciting performance luxury sedan in Acura history.

Moreover, as the sales volume leader for the division, the TL is also Acura's most important car. In completely redesigning the TL from the wheels up, Acura aimed to enhance literally every aspect of the original model. Featuring a stiff unit-body construction with expansive use of high-strength steel (as well as key aluminum components), unique and dramatic exterior styling, a choice of two powerful VTEC V-6 powertrains (280-hp 3.5L and 305-hp 3.7L), all-new Electric Power Steering (EPS), and a luxurious and technologically advanced interior, the new TL sets the benchmark for the future direction of the Acura division

The 2009 TL SH-AWD® makes a significant advance in both on-road performance and driving exhilaration as it significantly surpasses the previous track-tuned TL Type-S in all measurable levels of handling performance. Moreover, not only is the new TL SH-AWD® more exhilarating when pushed on challenging roads, but in day-to-day use it delivers a more rewarding and exhilarating level of driving excitement. Without a doubt, the first ever application of SH-AWD® with the TL sedan-Acura's best selling sedan-marks a new milestone for performance, drivetrain sophistication, and safety.

Not only is it the best performing Acura TL ever, but the new TL SH-AWD® is a top performer amongst every vehicle in its class.

The TL SH-AWD® is powered by a new 3.7-liter V-6 that shares many features with the 3.5-liter engine, but gains displacement through larger cylinder bores and increased stroke. With 305 horsepower and 273 lbs-ft of torque, the 3.7-liter engine is as powerful as some V-8s, and is the most powerful engine ever offered in an Acura. Compared to the previous generation TL Type-S 3.5-liter engine, the 2009 TL's 3.7-liter V-6 has gained 19 horsepower and 17 lbs-ft of torque. Similar to the 3.7-liter engine that now powers the 2009 RL sedan, the new TL SH-AWD® engine features a new VTEC® system which varies the exhaust valves as well as the intakes to contribute to elevated power output. The engine is even lighter than the 3.5-liter powerplant it replaces, due in part to the use of aluminum rather than iron cylinder liners.

The 3.7-liter TL SH-AWD® cylinder liners are made of high-silicon aluminum and are cast directly into the aluminum block. The hard piston ring sealing surface of the liners is created during manufacturing with a mechanical etching process that exposes silicon particles embedded in the sleeves. The aluminum sleeves provide better cooling thus allowing closer piston-to-cylinder clearance than iron liners afford. The alloy liners also improve heat dissipation in the area between adjacent cylinder bores, allowing the SH-AWD® engine to have larger cylinder bores, even though its bore-center dimensions (the distance between the centers of adjacent bores) remain unchanged.