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Stage 1 91 octane : up to 20% HP / 12% TQ
Convertibles:
Since our development many others have followed making silicone inlet systems
Multiple stage tunes offer for most vehicles
and versatility to tuning any modern day vehicle at an affordable price
Stage One BMW Speaker Upgrade for G42 Coupe with Standard Hi-Fi F23 230i Stage 1 91 octane :GET 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
