Foil backed bitumastic type deadening material is good for around the boot. I took out all the boot liners and coated the inner rear wings, and all around the boot and wheel well, then used some stuff called dodomat to double the padding on top of the bitumastic one.
Deadened the drumming from the exhaust.
In addition i put a layer of the dodomat which is heat and fire resistant on the bulkhead.
Made a difference in my 2002 car, but made no difference on my 2001 car, so i think you are just going to have to try it and see.
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