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For those of you that already have a RE|FLEX
Stage 1 E30 octane: up to 28% HP / 27% TQ
Your satisfaction is our priority
 Of course
B48-H (High Compression) models:
Stage One BMW Speaker Upgrade for E82 with Standard Hi-Fi/Harman Kardon BMW-F3X 335i-2014 For those of you thatGET 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
