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To get a detailed description of each category and it's available options, to help you make the correct selection.
Retain Steering Wheel Controls
Keep your factory steering wheel controls with Metra's ASWC-1. Easy to install with an aftermarket radio, easy to program with our auto detect feature.
Replace Factory Radio
Remove that featureless factory radio and install an aftermarket radio with Axxess's radio replacement interfaces and harnesses.
Add Remote Start
Cut down in installation time with Axxess's remote start vehicle specific harnesses.
Add Cameras to Factory Radio
Stay aware of your surroundings and improve safety by adding cameras to your existing factory screen.
Add Amp to Factory Radio
Get the sound quality you're looking for by adding aftermarket amplifiers to your factory radio with Axxess's Add-n-amp option.
Device Connection
Stay safe and connected while driving by installing an Axxess connectivity interface and mobility products.
Digital Signal Processor
Upgrade your sound, keep your factory radio and retain your functions with our versatile digital signal processor.
Override Engine's STOP/START
Override Interface for Ford, Chrysler, Dodge, & Jeep®. Simple install to override or re-engage the stop engine feature!
< Back AXEU-MOST25


European MOST25 Amp Retention Interface

USA MSRP: $371.99 USD

Vehicle-specific add-on amplifier interface for use when replacing the factory radio, such as with Metra’s dash kits. It is designed to retain the Harmon Kardon® amplifier in select BMW. This interface will also retain the balance audio feature when replacing the factory radio and is Micro “B” USB updatable.

  • Add-on amp interface to use with Select Axxess interfaces
  • Retains Harmon Kardon amp in BMW
  • Retains balance
  • Micro “B” USB updatable


  • 1 Series 2010-2020
  • 2 Series 2014-2020
  • 3 Series 2011-2018
  • 4 Series 2014-2020
  • 5 Series 2010-2016
  • 6 Series 2010-2017
  • 7 Series 2010-2015
  • X1 2015-2020
  • X3 2010-2018
  • X4 2014-2018
  • X5 2014-2018
  • X6 2015-2019

Mercedes Benz

  • C Class 2008-2014
  • CLK Class 2008-2010
  • CLS Class 2008-2015
  • E Class 2008-2015
  • G Class 2008-2015
  • GL Class 2008-2015
  • GLK Class 2008-2015
  • M/ML Class 2008-2015
  • R Class 2008-2015
  • SL Class 2008-2015
  • SLK Class 2008-2015