Ive been reasearching this.. the 2005 TL is rated 270 HP with 232 lbs of tq and the 2006 TL is 258 HP with 233 lbs of tq...why is that? Did they tune it down or something?

 

Found it....

For 2006, it's rated at 258 horsepower, and while that may sound like a downgrade in power compared to last year's 270-hp rating, in reality it's the same exact engine. The numbers are different because this year, the Society of Automotive Engineers instituted new industry standards for measuring an engine's horsepower rating. While many 2006 vehicles' specs remain the same as last year's, some turned out higher, and others — like the TL — wound up being lower. But again, the car feels no less powerful when driving than it did before, despite the revised figures.