A4 B6 Rear cowl replacement: considering ditching the carpet for plastic

I'm thinking to ditch the carpet in favor of plastic in the rear wheel wells of my A4. the carpet seems to be cutesy of the improved sound insulation (that
was likely a part of the sport package).
Sooo, me thinks going plastic with a twist: attach sound deadener mats on the inside and/or outside of the cowl. Any ideas what the cons would be and how well the bolts and nuts would support the additional weight?
There seems to be an attachment point on top of rear left wheel well but not on the rear right, if the body shop frontman is to be trusted (I have asked when they coaxed the carpet back into the well why they have attached it twicely on the rear (right) but not with a single fastener on the top of the cowl: he said it's the usual arrangement when the mat is stuffed into the well and prevented from moving about by the attachments on the opposite sides of the well only, which makes me wonder about that additional top attachment point in the left well)
P.S. 4-5" of road clearance are not really that much conducive to gravel road travelling so I wonder if I should bother with the extra mats: the sound deadeners inside the cabin seems sufficient but there has to be a reason ingolstadt used plastic in the front arches but used carpet like material in the rear of my avant.
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