I installed this system in my 2001 Nissan Frontier Crewcab pickup and I can tell you it won't fit under seats. I used a 8 gage wiring kit from a local retailer and currently using the rca hookup with my JVC head. Not sure how I like how the reciever treats the head when you shut off the sub from the head, the speakers all cut out. The sound that comes out when activated is just what the doctor ordered. I was looking for something to fill in the gaps that my kenwood speakers were missing. Like some of the reviews stated it not gonna wake the neighbors (well it will have them guessing though) but it got a kick to it that fills all the gaps in my music. I listen to a varity of music and it does it all nicley, except for deep bass, then ya gotta kick it down a bit. I installed it behind the rear seat and after a bit of tucking along the side it is completly out of view , except for the big sound that comes from my system. I would reccomend this system but I am waiting to see how the summer heat effects. I am in my first month of ownership and still adjusting the sound for my perfect music fit.