How is it impractical? You don't need 2 18 inch subwoofers in a wall to enjoy music....in fact, it's far from an SQ install obviously. (Not that it won't sound good) When I get in my car I prefer to enjoy it's handling characteristics and be able to drive it how it was meant to be. I have had a wall in a vehicle, and the weight of it just makes the car no fun at all. It will also tear through axles if your car is FWD. I'd rather have 1 15 slamming in the trunk and be able to enjoy my car's limits than suffer the performance depreciation and hundreds of added lbs a system adds.
But I'm not knocking, just stating why I feel it's impractical...to each his own, and awesome looking install so far. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif