Stage One BMW Speaker Upgrade for G01/F97 X3/X3M with Harman Kardon G31 Ethanol Sensor Included: NO -

Ethanol Sensor Included: NO - Available Here

That's why we engineered the Ghost Subwoofer Upgrade to perfectly and seamless match our legendary Stage One Speaker Upgrade

Center flow port injection (fits all brand injectors)

NOTE 1: If you vehicle has had any software updates recently

Stage One BMW Speaker Upgrade for G01/F97 X3/X3M with Harman Kardon G31 Ethanol Sensor Included: NO -GET 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