I'm hooking up a sound system in my car soon. I'm installing a Double DIN poineer 7" Player,one JL Audio 12w6 with a JL Audio 500/1 Amp. The trunk will be fitted with dynamat, and I'm excited. However, I see in a alot of cars of which their reats seats don't fold down, I was wondering if it be wise that I cut a square hole behind the armrest section of my rear seats in my car. Now, I'm not too sure if this will affect the integrity of the Lexus quality seating, but if it doesn't, and if it won't hurt, and if it isn't too much of a hassle, I would like some advce or opinions on how I should tackle this task, or how I shouldn't tackle this task. Any words would be greatly appreciated.