Sound dampening materials

Hey everyone, I reallllly need something to stop all the rattles in my car. I have 3 MA Audio 100D6 subs, a RF 700s amp, and a RF 1.0 Farad cap. The system hits realllly hard, I mean, when I have the bass up on the Remote bass knob, my wipers bounce off my windshield. Well, with that, I have toooons of rattle too. I usually leave it at 1/2 way, cuz any higher, it sounds horrible. I am looking at Dynamat and brownbread. Are there any other companies that make stuff to stop the rattle for cheap? thanks.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

I would suggest you go with Brown Bread and lots of it! You will want to gut the interior of your car and cover every nook and cranny.  Brown Bread in my opinion is one of the best deadening products out there. It’s just as effective as Dynamat and costs much less. You can do your whole car for about $300 where as Dynamat you would be in the thousands. If you tell me the type of car I can tell you about how may SQ/FT you will need.

I am pretty new to car audio.  Where do you get Brown Bread?  I have used dynamat on my doors but still getting some vibration.  Will Brown Bread help?

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4quarter