I have premium sound, but my grills don't say it. According to Crutchfield, if the grills say "Stereo" on them, they are "Premium " Sound. The best way to check is to look behind your glove box (push the 2 "ears" back and open it all the way) and see if the Amplifier is there. It is in the upper right hand corner behind the glove box. Since I bought my HU from Crutchfield, they sent me the harness adaptor and amplifier bypass free.
