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its a must if you upgrade the stock stereo system, dampens vibrations and makes the speakers sound one hundred times better. also keeps out some road vibration/sound. usually one of the first mods i do to my car..
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-Rev
SGM e92 335xi|Helix|AFE|AWE|PROCEDE|SYNAPSE|ER|OSS|BMW PERFORMANCE|P3|always growing..
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