Before you spend money on dynamat, go through your trunk with the side panels out and check for loose bolts and things like that.
You would be surprised how much of the rattle you can avoid by just tightening things.
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"I'm not driving too fast...just flying too low"
Mine:
-87 ranger- broke
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project
Prolly cheaper to cause dynomat is some pricey shit
not only cheaper but TONS easier to install in a car, thats all I ever use. I hate Dynamat cause sometimes it feels like its a hit or miss when your heating it on. that right sucks ass for something thats $$
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1989 5.0 - Mustang Brandy the NOW It can Barely Idle B**ch
1999 Jeep Cherokee Sport 4.0 - Yeah Its Gotta Baby Dick Lift