HAW PSM Style Dry Carbon Fiber Rear Diffuser for BMW M3 G80 / G81 M4 G82 / G83

Prepreg Dry Carbon Construction

Every HAW carbon fibre product is manufactured using a prepreg dry carbon process. The carbon fibre fabric is autoclave-cured under high temperature and pressure, with resin content precisely controlled between 37% and 42%. This ensures each piece achieves exceptional structural rigidity while remaining significantly lighter than wet carbon alternatives.

We use Toray standard-grade 3K twill-weave carbon fibre tow to produce our fabric. 3K means each carbon bundle contains approximately 3,000 individual filaments. The twill weave creates the classic diagonal texture — one that shifts subtly under changing light, understated yet impossible to ignore.

HAW PSM Style Dry Carbon Fiber Rear Diffuser – BMW M3 G80 G81 / M4 G82 G83

Complete the rear end with purpose. The HAW PSM Style dry carbon fiber rear diffuser is inspired by PSM's signature aggressive diffuser design, engineered to enhance both aerodynamic performance and visual impact on your BMW M3 or M4. Precision-crafted in prepreg dry carbon for a piece that performs as aggressively as it looks.

Key Features

• Dry Carbon Fiber Construction – Autoclave-cured prepreg carbon, lighter and stiffer than wet carbon alternatives, finished in a premium 3K twill weave
• PSM Style Design – Inspired by PSM's distinctive diffuser styling, with aggressive fins and sharp lines that complement the M rear bumper
• Aerodynamic Benefit – Improves rear airflow management for a cleaner, more planted look at speed
• Direct OEM Fitment – Designed specifically for G80 / G81 / G82 / G83 chassis; no cutting or modification required
• UV-Resistant Clear Coat – Protects the carbon weave from yellowing and fading over time
• Significant Weight Reduction – Lighter than the factory plastic rear diffuser

Available Finishes

• Gloss Dry Carbon – High-gloss clear coat for a deep, reflective finish
• Matte Dry Carbon – Satin clear coat for a subtle, stealth look

Fitment

• BMW M3 Sedan (G80)
• BMW M3 Touring (G81)
• BMW M4 Coupe (G82)
• BMW M4 Convertible (G83)

What's Included

• 1x HAW PSM Style dry carbon fiber rear diffuser
• Fitting hardware

Professional installation recommended. Please verify fitment with your chassis code before ordering.