You are here for one reason – you wish your F33’s sound system could raise the roof in your BMW. And by that we do not only mean enhancing the power of your stereo, but a spectacular effect of detailed, well-balanced and accurate sound coming from your 4 Series speakers.

BimmerTech’s F33 audio upgrades will bring it to you. However, there is something more you can expect – the cherry on top that was never offered before by any car audio manufacturers. We will equip your amplifier with a custom DSP tuning file, which is going to deliver you sounds adjusted to your musical preferences – the genres you are listening to and the way you prefer listening to them.

The number of speakers in F33 and the presence of an amplifier will highly depend on your stock system though. So before getting excited about an upgrade, look up whether your F33 features Base, Hi-Fi (S676A) or Harman Kardon (S688A). You can check it by decoding your VIN.

If you are a hands on DIY-er, you can also try to install our audio upgrades yourself. It’s a straightforward process – nothing more complicated than a bit of disassembling and removing your original F33 BMW speakers / amplifier, and putting the new ones in.