spaces. Dynamat is SUPPOSED to be used over major hose in paneling to dismiss echoe effect of sheetmetal and road noise. If your serious-> lay Dynamat over may holes (primarily in the rear and sides). Then have Cascade sprayed in the entire interior. Then contact ITW Foamseal and foam inject that inside the paneling for added sound deadening and stiffness in the frame. You'll notice a difference then. That is what I did but haven't heard the Z on the street yet. Soon....