Stage One BMW Speaker Upgrade G11/G12 7 Series with Harman Kardon (No Install Video) f23 Stage 2 ACN91 octane: 13%HP

Stage 2 ACN91 octane: 13%HP / 28% TQ

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then you will not be able to have your DME unlocked for tuning

Coil power wires are sold in packs of 6 so you get all new power wires for each cylinder every time

Stage One BMW Speaker Upgrade G11/G12 7 Series with Harman Kardon (No Install Video) f23 Stage 2 ACN91 octane: 13%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