This is my first post here and wanted to hear what some of your opions are for a system. I have a 01 GMC Sierra EXT cab. The back seat will be taken out. Thought about putting 4 9500 12's in but was told not to by a local shop saying it would be too much. So I want to know your opions. 12's or 10's and 9500 or 8500. Not going to any show or competion with this. Just want some knock to take your breath away. Any response would be great. Thanks.
