I have got 4 12 kenwood excelon in a 2008 scion xb, Kenwood flip up face 6.5components and 2 1600 class d amps and 2 200 watt amps on the highs. 5 farad digital capacitor. I hit right around 178. decs. Now don't get me wrong they are nice to listen to but you can't blast any system all the time...