hahahahaha....the reason that makes aftermarket decks are better than OEM is because the fact that they have better features. All you can do on an OEM is Fade Balance Bass and Treble...My Eclipse has endless options which changes the sound (for the better) coming from the speakers, where as...
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wtf is that guy talking about. it only makes it sound worse if you buy a ****ty deck.
a headunit can make a huge difference, id recommend pioneer, alpine, eclipse, and ive heard some of the new clarions are good.
ive dealt with ikesound.com i bought my old pioneer from there... i didnt have a problem with them, but i have heard 1 or 2 complaints about them on caraudio.com
its damn near impossible to shatter your windows.
and for those of you who question the type R i can give you the screen name of the man who tested them, he builds boxes specifically for the type R with a unique design he will not share.
look at the amp ratings at each ohm. for instance
1000watts x 1channel @ 1 ohms
500 watts x 1 channel @ 2 ohms
250 watts x 1 channel @ 4 ohms
you said you had a 15L7? id power it with about 800-1200 watts. So look for an amp that provides that power at 2 ohms.