Car Amplifier Plug & Play BMW 4 Series 520 Watts Max 4 Channel Powerbox65.4 Amp
VIBE Amplifier for BMW 4 Series Powerbox65.4 Car Audio 520W Peak Amp. Better Sound Quality?. Is this what you want?. But scared to upgrade?. VIBE have produced a market leading Plug and Play Amplifier to suit your BMW.