LED Rear Bumper Diffuser for Audi A4 S-Line / S4 B9 Sedan 2016-2019

Turn Heads Day and Night — Built-In Red LED Lighting

Most rear diffusers are purely cosmetic. This one goes further. The integrated red LED lighting transforms your A4 S-Line or S4's rear end after dark, adding a striking glow that makes the car look like it belongs on a stage — not just a street. During the day, the gloss black finish delivers a clean, aggressive body kit look that elevates the entire rear bumper profile.

Important: This diffuser is designed exclusively for the A4 S-Line and S4 B9 Saloon (2016–2019 pre-facelift). It is not compatible with the standard A4, hatchback/Sportback body styles, or the B9 facelift model.

Why This Diffuser Stands Out

• Built-In Red LED Lighting — Integrated LEDs illuminate the diffuser at night for a dramatic, show-car effect that no standard diffuser can match.
• Gloss Black Finish — Pre-finished and ready to fit. Complements factory S-Line and S4 trim lines seamlessly.
• Direct Replacement Fitment — Engineered to OEM specifications for the B9 S-Line/S4 saloon. Mounts using original car screws and buckle clips for a secure, factory-quality installation.
• High-Quality ABS Construction — Lightweight, durable, and built to handle all weather conditions without warping or fading.
• Instant Rear-End Transformation — One of the most impactful exterior upgrades available for the B9 platform, combining aerodynamic styling with functional LED lighting.

Fitment

Compatible with:

• Audi A4 S-Line B9 Sedan 2016, 2017, 2018, 2019
• Audi S4 B9 Sedan 2016, 2017, 2018, 2019

Not compatible with:

• Audi A4 Standard (non S-Line) B9
• Audi A4 Hatchback / Sportback body styles
• Audi A4 / S4 B9 Facelift models

Installation Notes

• Installs using buckle clips and original car screws — tape is for positioning only, screws are required for a secure fit
• Professional installation is strongly recommended
• No installation instructions included

Specifications

• Type: Rear Bumper Valance Diffuser with LED
• Material: High-quality ABS Plastic
• Finish: Gloss Black
• LED Color: Red
• Placement: Rear, lower bumper
  
• Package includes: 1x Rear Bumper Diffuser Valance

German Parts Warehouse is not affiliated with, sponsored, or endorsed by Audi AG. All model references are used for fitment identification purposes only.