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rubberized undercoating the wheel wells in the back helped me a bit, but your best bet, but not the cheapest is getting like dynamat or similar sound deadening material and line everything.
 

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Well,

If you wanna go cheap, you can always fill in your trunk with foam insulator you buy @ home depot. I forgot the site, but there are a couple automotive audiophiles that just fill every possible cranny that isn't dynomated with this foam insulate.

Howie~
 
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