I have the original factor installed insulation plus some additional padding. Further as this is made out of a roof skin with 5 inches removed from the center then welded in pretty tight, right now there is zero movement or vibration. Mind you the car isn't running yet, so i am hoping that it will be pretty quiet. But if it isn't that's fine.
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68 Camaro 632 BBC 800+ HP Project (600Kw)
61 Buick Lesabre Bubbletop (daily driver)......miles of smiles
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