Aston Martin DB11 diffuser carbon HY5317E955 EA

part number HY53-17E955-EA (or HY5317E955EA) refers to the Genuine Gloss Carbon Fiber Rear Diffuser for the Aston Martin DB11.

This is an “Ultra-Premium” exterior component, typically found on V12 Launch Editions, the AMR (Aston Martin Racing) trims, or cars equipped with the “Exterior Carbon Pack.”

1. Technical Specifications

• Material: 2×2 Twill Weave Carbon Fiber with a high-gloss, UV-resistant clear coat.

• Application: Aston Martin DB11 (V12, V8, and Volante).

• Function: It manages the airflow exiting from under the car to reduce lift. It also serves as the mounting frame for the exhaust finishers.

• Suffix “EA”: This suffix specifically identifies the Carbon Fiber finish. In contrast, the “AK” or “AD” suffixes denote the standard black plastic or painted versions.

2. V8 vs. V12 Visual Differences

While the main carbon fiber structure of the 17E955-EA is largely consistent, the exhaust tips it accommodates tell the story:

• V12 Models: Usually paired with a diffuser that features the massive single-exit “tailpipe finishers.”

• V8 Models: Often paired with the quad-tip exhaust setup.

• Note: If you are upgrading from a plastic diffuser to this carbon unit, you must ensure your current exhaust tips are compatible with the apertures in the carbon frame, as the finishers are often bolted to the bumper structure, not the diffuser itself.

3. The “Aeroblade” Integration

The DB11’s rear aerodynamics are complex. The diffuser works in tandem with the AeroBlade (the air intakes in the C-pillars). When replacing this part, ensure the lower mounting points are secure; if the diffuser is loose, it can create turbulent air that negates the efficiency of the AeroBlade system.