As said the bottom of the trunk is easily accessible, and also lifting away the back seat is easy and you can install some dampening mat there too. I did some insulation on my ST, if you want to see pics you can check out my intro-thread on the members gallery: https://www.astrakforums.co.uk/viewtopic.php?f=10&t=5320&p=47937#p47937
Tyres make the biggest difference of anything you can do.
The problem of the non watts link suspension cars is that the rear tyres get louder the more mileage you do so you need to occasionally rotate the tyres if possible to minimize this. +1 primacy 4, I came from horrendous primacy 3's which were probably ok when 1st put on.
trunk defo ... ive got all sorts of stuff in there ... almost cant use it for padding! ... but stops the booming
....plus oddly having the ac pump replaced made it quieter :/
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