Description

The NW Carbon Haus 7 Piece Race Diffuser and Undertray is a comprehensive rear aero upgrade for the BMW M3 and M4 (G8X), replacing the factory undertray and diffuser components with a full pre-preg dry carbon fiber assembly. The multi-piece construction delivers a clean, layered look with genuine functional aero intent — this is not a cosmetic lip clip, it is a full undertray system built for drivers who take the rear end seriously.

Molded from genuine pre-preg dry carbon fiber, each piece is cured under controlled heat and pressure for a consistent weave, precise fitment, and a finish that holds up under the heat and debris exposure of an active undertray environment.

Fitment

Direct-fit for the following G8X-generation BMW M models:

• G80 — M3 Sedan
• G81 — M3 Touring
• G82 — M4 Coupe
• G83 — M4 Convertible

Installation

• Mounting Method: Existing OEM mounting points with minor modification to OEM components
• Drilling Required: Yes — drilling into carbon components and two small holes in the heat shield required to secure the undertray

We strongly recommend professional installation by a shop experienced with carbon fiber aero and BMW undercarriage work. This is a 7-piece system that requires drilling into carbon components and modification to OEM heat shield — mistakes during installation are not reversible. Proper fitment and secure mounting are critical given the undertray's exposure to road conditions at speed.