I did sound / heat proof ours with the Dynamat self stick product. IMO I do not think the hard foam is a good idea. I'm not saying it couldn't be done. But the adhesion, forgiveness and final outcome in the Dyanmat or like product makes for a Factory Installation & Worth the $$$.. I used my extra outside above wheels trying to "cool the floor" where my feet rest while" driving.
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Rev. Jeffrey 2017 Thor Axis 24.1 E450 Windjammer.
Silver Safe-T-Plus Steering Control
SSF-106-40 SumoSprings Solo Front Bump Stop SSR-107-47 SumoSprings Rear Bump Stop
Hellwig 7718 Front Sway Bar & 7180 Rear Sway Bar
Koni FSD Front Shocks 8805-1042 / Koni FSD Rear Shocks 8805-1043
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