I ordered 6 of them today from Crutchfiled...talk about good service, they took the order and a couple hours later I get a shipping notice. These are all going behind the seat of my '07 GMC Crew Cab. Of course I'll need to move the rear seats forward 2 inches or so, but that's pretty simple since the entire interior is going to out for sound deadening. I hope I like how 8's sound, this is my first time owning 8's, I have always had 10's and larger, but after doing an install in my friend's Scion xB with a single Kicker L7 8", I was more than impressed and he is only running 150 watts to it. I have MUCH more than that on tap and for some reason I have a feeling that Polk will be better, especially the Momo subs.