its not night and day difference, but I do notice some difference.
in addition to that, I put the sound deadner carpet under he boot floor cover (that big black square thingy-ma-jig).
I would've liked to have put more under the rear seats, but I couldn't do much as it required the removal of the side door trim & panels.
with regards to the rear seat - u can easily remove the seat base, as per brad's comments.
the seat back, on the otherhand, is more work - I haven't bothered with that.
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