take a visit to crutchfield.com there is alot of information there to learn about stereo installation, even has video, and suggestions for our trucks as far as sizes of stuff.
plus they have a pretty good selection of products. their catologs, (if they even have them anymore) were always good for browsing over, and over....lol.
i too had an infinity system in my scirocco, and found that infinitys NEED power, and lots of it, to make them sound good, and even then, the sound always kinda sounded
"metalic" or "tinny". polks are good stuff.