An up close look at the all new Acura RL.  For the 2009 model year, the RL received an extensive mid-model change (MMC), and made its introduction at the Chicago Auto Show on February 6, 2008, billed as "the most extensive Acura MMC ever". The new sedan was designated KB2 in the VIN codes, differentiating it from the 20052008 KB1 chassis VIN code. The revised sedan was released on July 1, 2008 to dealerships. The engine is upgraded to 3.7L with 300 hp (220 kW). While on paper, the engine may seem to be the same unit as shared with the Acura MDX, it is actually a variant that introduces for the first time ever on a SOHC Honda V6, an implementation of the Honda VTEC variable valve train technology on the exhaust side for improved horsepower and torque. Heretofore, all previous SOHC Honda V6 with VTEC used the technology on the intake side only[19]. The engine emissions has been improved to meet the stricter U.S. Environmental Protection Agency (EPA) TIER 2  BIN 5 and California Air Resources Board ULEV-2 standards. Implementation of the SH-AWD was adjusted for earlier intervention and a more rear wheel bias for better handling dynamics (WIKIPEDIA)  for more info please visit acura.com