Stage One BMW Speaker Upgrade for E83 X3 with Standard Hi-Fi G2x 3 series It is programmed with the

It is programmed with the Split Second R4 engine management software included on CD or available for download here

Stage 1 93 octane: 28%HP / 31%TQ

Matched wire gauge: Yes

Do-it-yourself installation in about an hour

Stage One BMW Speaker Upgrade for E83 X3 with Standard Hi-Fi G2x 3 series It is programmed with theGET 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