I just have extra custom made floor mats for driver and passenger. There was a link posted on TM a few years back to the eBay seller. Black carpeting with red trim, they suited my car but had to be cut down and re-trimmed, an expensive exercise as advertised for a Plus 8. They do protect the OE carpeting and offer some sound reduction though.
On the decking the well laden custom aluminium tool tray adds enough weight to deaden any panel reverberation.
