Stage One BMW Speaker Upgrade for F25/F26 X3/X4 with Standard Hi-Fi 340 Stage 2 91 octane: 28%HP

Stage 2 91 octane: 28%HP / 42%TQ

Translation

Even though our woofers are designed to be extremely efficient to maximize the output of your factory amplifier

Stage 2 93 octane: up to 18% HP / 28% TQ

Welcome to the sales

Stage One BMW Speaker Upgrade for F25/F26 X3/X4 with Standard Hi-Fi 340 Stage 2 91 octane: 28%HPGET 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