BMW 1 3 Series E87 E90 HiFi Audio Speaker Amplifier Retrofit Kit Set 0445684

BMW 1 3 Series E87 E90 HiFi Audio Speaker Amplifier Retrofit Kit Set is an original retrofit kit for the audio system in BMW 1 Series E87 and 3 Series E90 models. The set is designed for the factory installation of a HiFi amplifier and speakers, allowing for a significant improvement in sound quality without interfering with the factory wiring architecture. This is a solution for users who expect a more advanced, precise sound while maintaining full compatibility with the vehicle's electronics.

Specifications and technical data

• SKU: 0445684
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0445684
• Substitutable numbers: 65410445684, 0445684, 65410445683, 0445683, 65132163807, 2163807, 65132153322, 2153322, 61120445686, 0445686, Alpine, Retrofit, BG
• Category: Other Starters, Alternators, ECUs & Wiring

Purpose and function of the HiFi retrofit kit

The presented retrofit kit has been developed for BMW 1 Series E87 and 3 Series E90 vehicles factory-equipped with the basic audio system. Its purpose is to prepare the car for the installation of a HiFi amplifier and appropriate speakers, in accordance with BMW factory standards. This makes it possible to achieve a more dynamic frequency response, better channel separation, and a more stable power supply for the audio path.

This type of solution is particularly beneficial for users who want to maintain the original interior look and full integration with the factory radio and comfort modules, while simultaneously expecting a clearly higher level of audio system performance.

Compatibility and integration with BMW installation

The HiFi retrofit kit has been designed for the electrical architecture of the BMW E87 and E90, which allows for installation based on factory mounting points and original cable routing paths. As a result, the installation can be carried out in an orderly manner, without the need to modify wiring harnesses or use non-factory connectors.

The original BMW origin of the components promotes proper cooperation with the vehicle's control modules, minimizing the risk of diagnostic errors and interference with the operation of other onboard systems. This is especially important in the case of cars equipped with extensive comfort electronics and safety systems.

Performance characteristics and installation benefits

Upgrading the audio system using the HiFi retrofit kit allows for a clearer, more balanced sound while maintaining the factory user interface. In practice, this means:

• better control over low and mid-range tones,
• more stable power supply for the audio path thanks to a dedicated amplifier,
• retention of full functionality of the factory radio and steering wheel controls,
• no need to use additional signal adapters.

The used condition of the kit makes it a cost-effective solution while maintaining the original BMW specification. For many users, this is a reasonable compromise between improving sound quality and controlling the modernization budget.

Condition, origin, and technical aspects

The offered HiFi retrofit kit comes from the BMW product line, which ensures compliance with factory quality and fitment standards. As an item in the Other category, it includes components intended for expanding an existing audio installation, rather than a complete overhaul. The used condition of the product means that the elements may show signs of wear typical for dismantled parts, while maintaining the functionality required for further use.

Before installation, it is recommended to verify the equipment configuration of the specific BMW E87 or E90 unit to confirm compatibility with the existing audio system and the intended amplifier location. Properly matching the vehicle configuration to the retrofit kit reduces installation time and facilitates subsequent diagnostics of any potential faults.

Expanding audio modernization in BMW

If you are planning a comprehensive repair or modernization of the audio zone in your BMW and need other elements from the same group, such as additional speakers, wiring harnesses, or amplifier mounts, check the available parts in the Other BMW category.

When expanding the audio system, it is also worth paying attention to the general characteristics of the drive and vehicle dynamics – especially in higher-power cars, where acoustic comfort and chassis stability are of great importance. In this context, an article comparing RS sports versions with standard models may be helpful, discussing, among other things, the impact of engine power, brakes, and chassis on the perception of the car as a whole: Audi RS vs other models – what is hidden under the hood and chassis?.