This is from Edmunds website......
What's New for 2006
Other than a new tire-pressure monitor and altered engine management (for reduced torque steer), the Acura TL is mechanically unchanged for 2006. As with all 2006 Acuras, there is a longer powertrain warranty for the TL. It now provides six years/70,000 miles of protection.
New SAE testing procedures have dropped the TL's horsepower rating from 270 to 258. That's code for "quit
on your HP claims."