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1:1 Boost reference regulator
It allows for factory integration with the ECU for multiport fuel injection
Installs and fits just like your factory BMW woofers
Color: Blue
Stage One BMW Speaker Upgrade for E60/E61 Sedan/Wagon with Standard Hi-Fi TIRES 1:1 Boost reference regulatorGET 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
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