I don't know why I was just thinking about this, but since so many people seem to be so impressed by trunks shaking, wipers bouncing, door panels flapping, and all the resonance and noise that some sound systems produce in the vehicles we drive, I just felt like throwing this out there... Is it just me, or do some vehicles seem to be more willing to do these kind of things than others? Everything has its natural resonance frequency and has the ability to shake, flex, rattle, or anything else it may feel like doing. That being said, I've seen plenty of vehicles with extremely loud setups, and killer bass inside the vehicle, yet while standing out side and observing, they tend to handle everything very well, and you don't hear every part of the car buzzing and rattling away, and you don't see deck lids jumping in the air. And then you see other cars with a mis-match of equipment throw together in what looks like 1st grade art project that sounds horrible, yet from out side the vehicle it looks like the thing is going to fall apart where it is sitting. When looking at my own vehicles, My RAM plays what I consider to be pretty loud (no, it wasn't built for SPL, yet it is uncomfortable for many of my passengers) and from outside the truck maintains pretty damn good control. Of course the mirrors shake like they should, but aside from that, my rear power sliding glass track and/or glass makes noise, and there is crazy turbulence noise coming from the two cab ventilators as air they are flapping around in the area between the cab and bed. On the other hand, my Toyota Camry which while driving feels like a very solid car, shakes and flexes like a mofo from a system that was thrown together with parts I had laying around, and does not play nearly as loud as the Eclipse or Truck. And finally my Eclipse which is not quite as powerful as the truck bounces the rear wiper off of the glass, makes my rearview mirror flip straight down so I can't see anything, yet the door mirrors shake only slightly more than the factory sound system. Whats the deal? Then when you throw youtube videos of roofs blowing off suv's and stuff, it just seems like there is no real pattern to how vehicle is going to react. All of this really doesn't mean anything, but as I said before. a TON of people judge a sound system not by how it sounds from the listening position, but by what it is doing to the vehicle it is installed in. I'm all for super loud, extremely hard hitting sound systems, but I am WAY more concerned about the how it reproduces the music I am listening to on my 60 mile round trip to work and back each day, and not what the people are thinking at the stop light next to me....