Audi R8 4s Carbon Fiber Wing Mirror, Model Year 2017

Part Numbers: * Left: 4S1.857.407.C (Housing) / 4S1.858.527 (Carbon Cap)

• Right: 4S1.857.408.C (Housing) / 4S1.858.528 (Carbon Cap)

  Application: Audi R8 Coupe & Spyder (Gen 2)

  Model Year: 2016–2018 (Pre-Facelift)

For the 2017 Audi R8, the carbon fiber wing mirrors were a flagship “Audi Exclusive” or “V10 Plus” standard option. Unlike aftermarket “stick-on” covers, the OEM units are constructed using a specialized resin-transfer molding process, ensuring the carbon weave is structurally integrated with the mirror housing to withstand the aerodynamic pressures of the R8’s 330 km/h top speed.

Technical Specifications

• Material: High-Gloss Twill Weave Carbon Fiber (CFRP).

• Functions: * Power-Folding: Electric motor-driven retraction.

  • Auto-Dimming: Electrochromatic glass to prevent glare.

  • Heated: Integrated heating elements for defrosting.

  • LED Indicators: Slimline dynamic LED turn signals.

• Weight: Approximately 25% lighter than the standard painted plastic variants.

Key Performance Features

• Aero-Acoustics: The 4S generation mirror shape was refined in Audi’s wind tunnel to reduce “buffeting” noise near the A-pillar, a common issue in mid-engine supercars.

• UV Resistance: Factory OEM carbon parts feature a specialized automotive-grade clear coat that contains UV inhibitors to prevent the “yellowing” or “milking” effect caused by sun exposure.

• Side Assist Integration: Many 2017 models include the Audi Side Assist (Blind Spot Monitoring) LED icon on the inner edge of the mirror housing.

Installation & Maintenance Tips

1. The “Door Card” Requirement: To replace the entire mirror assembly, the interior door panel must be removed to access the main electrical connector and the three T30 Torx mounting bolts.

2. Mirror Glass Transfer: If you are swapping only the carbon caps, be extremely careful when popping the glass out. The electrochromatic (dimming) glass is very expensive; use a wide, flat plastic pry tool and apply even pressure.

3. Ghosting/Vibration: If the mirror vibrates at high speeds after installation, ensure the internal reinforcement bracket is seated perfectly. The 4S chassis uses a high-torque mounting spec to eliminate mirror blur.

4. Cleaning: Warning: Avoid using “buffer” machines on the carbon caps. Heat friction from a high-speed polisher can delaminate the clear coat from the carbon fiber. Use only high-quality carnauba wax or a ceramic coating.

Compatibility Check

Inventory Note: These mirrors are often sought after as an upgrade for the base V10 models that came with body-colored mirrors. A genuine carbon set significantly increases the “curb appeal” and resale value of the vehicle.