🟩2005 - 2008 Audi A4 Quattro S4 RS4 Radio Amplifier Amp Bose OEM 8E5-035-223-E Tested - Cleaned and Inspected - 30 Day Warranty - Free Returns - Removed from 2008 Audi S4
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OEM Mercedes · BMW · Audi
🟩 2005–2008 Audi A4 Quattro / S4 / RS4 OEM Radio Amplifier — BOSE — 8E5-035-223-E
Part Number: 8E5-035-223-E
Audio System: Factory BOSE Premium Sound
Type: Genuine Audi OEM Radio Amplifier
Condition: Tested • Cleaned & Inspected • 30 Day Warranty • Free Returns
Removed From: 2008 Audi S4
This is a genuine OEM BOSE radio amplifier designed for 2005–2008 Audi A4, S4, and RS4 models equipped with the factory BOSE premium sound system. It was carefully removed from a 2008 Audi S4 and thoroughly inspected to ensure full functionality.
The amplifier is a critical component of the factory audio system, responsible for powering the speakers and delivering balanced, high-quality sound throughout the vehicle. If your current unit is experiencing no sound, distorted audio, intermittent speaker output, or system faults, this OEM replacement is the correct solution to restore factory audio performance.
Using a genuine Audi/BOSE amplifier ensures proper integration with your vehicle’s head unit and MOST fiber optic communication system.
Prior to removal, the amplifier underwent functional testing to confirm proper operation:
✔️ Powered on and communicated correctly with vehicle system
✔️ Clean, undistorted audio output across all channels
✔️ No static, cutting out, or signal loss
✔️ Fiber optic and power connectors inspected and intact
✔️ Mounting points verified secure
This unit is fully functional and ready for installation.
• Professionally cleaned and sanitized
• Casing free of cracks or structural damage
• All mounting tabs intact
• Connector ports clean and undamaged
• Normal cosmetic wear consistent with age and use
The amplifier has been carefully stored to prevent damage and maintain reliability.
Compatible with the following models equipped with factory BOSE premium sound system:
✔️ 2005–2008 Audi A4 Quattro (B7 chassis)
✔️ 2005–2008 Audi S4
✔️ 2007–2008 Audi RS4
⚠️ Important Fitment Notes:
• Must have factory BOSE audio system
• Confirm part number: 8E5-035-223-E
• Verify compatibility using VIN if unsure
• Some vehicles may require coding after installation
• Not compatible with non-BOSE/base sound systems
Always match your existing part number before purchasing to ensure proper fitment.
• Genuine Audi OEM component
• Specifically tuned for BOSE speaker system
• Seamless integration with factory head unit
• Maintains original sound quality and system balance
• Designed for MOST fiber optic audio network
OEM amplifiers prevent compatibility issues and maintain the original acoustic tuning engineered for your vehicle.
• Direct replacement for matching part numbers
• Typically located in the trunk area (left or right side depending on model)
• Plug-and-play installation when part numbers match
• Professional installation recommended
• Coding may be required in some cases
✔️ 30 Day Warranty
✔️ Free Returns
✔️ Purchase with confidence
This OEM BOSE radio amplifier (8E5-035-223-E) for 2005–2008 Audi A4 Quattro, S4, and RS4 models has been fully tested, cleaned, and inspected. It is ready to restore clear, powerful factory sound performance to your Audi’s premium audio system.