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Black glass fiber reinforced cones offer improved strength over conventional polypropylene or paper cones
2017–present G30/G31 540i
 This is a perfect way to add reliability while increasing air flow
Bootmod3 app and cloud services offer many unique features not found in any other flash tune including and available TODAY:
Stage One BMW Speaker Upgrade for G29 Z4 with Harman Kardon (No Install Video) G31 Black glass fiber reinforced conesGET UNBELIEVABLE, CRYSTAL CLEAR SOUND. JUST BY REPLACING YOUR BMW'S SPEAKERS We took your factory BMW speakers and re engineered our upgrade for one thing: clarity. So you can simply swap your original speakers for ours without changing anything else in your audio system, and the result is smooth, natural, yet unbelievably detailed reproduction of your favorite music. PLAY YOUR MUSIC LOUDER. AND ENJOY EVERY NOTE: We engineered the Stage One speakers
