The only difference between the two years are: A few different colorsTire Pressure Monitoring SystemEngine management system to help reduce torque steerEngine was rerated at 258 hp (old was 270 hp) due to new, stricter engine rating system - the engine was identical to the '04 and '05 engines.FYI: the 3rd generation TL didn't get the larger optional engine of the Type-S until the '07 &'08 model years.