After one year I decided to upgrade my Prius audio system! Thanks for PriusChat I found out valuable information. I've acquired all the material and posting more details on what I've done and what I've used: MB Quart Premium PVI216 6.5" front speakers 2 x MB Quart Discus DSC450 200 Watt A/B Class 4-Channel Amplifier one for the sub and the other for the front speakers. Sub: Bazooka BT8024DVC BT Series 8-Inch 4-Ohm Dual Passive Tube 2 x 1.7 Farad capacitor Trunk plate: The final product...Pretty stealth!