I have a pair of Harman/Kardon power amps that came out of two different 9-5 sedans. One came from a 2003 model, and has a blue label, and the other came from a 2006, and has a red label. They look the same from the outside, and they drive the same number and type of speakers, as far as I know, but I'm wondering if anyone knows what changes they made to the amp. They must have done something to the amp when they switched from the Pioneer headunit to the GM one in the Dame Ednas. Thanks!