Anyone used a floor insulation for the heat and sound reduction in their tri-five? I cleaned and wire brushed my floor which is now solid again after a replacement of the rear seat floor sections. Sealed the floor but am now thinking would be the time to install some sort of heat and sound barrier, just don't know what to use. Looking for some real world experience here from members as to what to use and what to stay away from. Also an idea of just how much insulation / square footage amount I would need for a 2 door sedan.