I Love my GTO and wish GM would import more HOLDEN models with V8 rear drive. But I need to upgrade Sound System. Want to get the Blue Tooth factory kit and was thinking of getting a JL CleanSweep and hiding some amps away and new speakers. My Question where are the 10 Speakers located? I see 1 in each door, 2rear, 2 Subs and suspect there are tweeters in vent looking grills in edge of dash? But can’t hear them. Anyone have any info on this, specific sizes would help Thanx in advance.