I just put 2 sundown 1500 saz's on 2 RE SX 15's in my Bronco... its real loud and accurate bass. The sundowns are really efficient also. I made a lot of electrical upgrades and a kinetik 2400 in the back, but I have no lights dimming at night playing at full volume.
The Sundown dealer in my area is going to meter my system soon so I'll put up some numbers