Double up?
 

Hey guys I need to know where i should double up in the car i ended needing more brownbread so i have another 70sq ft again and my Boot(trunk) is coverd completely. So where do you think i should double up?

Honda Civic Si 2000

I had a minor issue under my rear seat... some deadening solved it.

Mark

Floor, or roof if you've done that.

Rear deck and trunk lid also. main places you get rattles.

I would probably get under the car with a rubber mallet and just tap a couple areas and see how dead they sound. I would also check the pillars for locations that could accept additional mat.