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Dynamat Xtreme quiets annoying road noise, improves a speaker’s dynamic range, and makes for a more comfortable driving experience. You can quiet down the noise, and get better sound. Kit contains four 305mm x 914mm pieces of Dynamat Xtreme to reduce road noise so you Hear More Music!™. Kit includes enough material for two standard size doors. For proper installation, use one of our Dynaroller tools.