Stage One BMW Speaker Upgrade for 2011-2013 E92/E93 Coupe/Convertible with Standard Hi-Fi BMW-F2X 135i-2013 The use of this manifold

The use of this manifold requires the extension of two harnesses

13psi boost reference switch (hobbs switch)

- GTS Startup Roar

E85 Compatible: Yes

Stage One BMW Speaker Upgrade for 2011-2013 E92/E93 Coupe/Convertible with Standard Hi-Fi BMW-F2X 135i-2013 The use of this manifoldGET 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