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DEI Boom Mat XL Damping Material - 12.5in x 24in x 4mm - 20.8 sq ft - 15 Pack Stainless Steel Exhaust System Manley 04+ Subaru WRX STiBoom Mat Vibration Damping Material is a premium quality damping material providing extreme noise damping for the most demanding commercial and sound competition applications. Interior panels vibrate and generate noise. Boom Mat stops that noise by trapping it between our thick, 4 mil aluminum stiffening top skin and the asphalt free, pure butyl, noise constraining layer. Plus worry free no snag adhesion to any interior surface, vertical or overhead,