BMW G8X M3/M4 Prepreg Rear Diffuser V2 2021-2025

The Prepreg Carbon Fiber Rear Diffuser V2 is engineered to give the BMW G8X M3 and M4 a cleaner, more aggressive rear-end profile while preserving true OEM-style fitment. Designed with sharper lines and a more sculpted form, it highlights the quad exhaust layout and adds depth and width to the rear without appearing overstyled.

Constructed from lightweight prepreg carbon fibre, the V2 diffuser enhances airflow beneath the vehicle, contributing to improved aerodynamic efficiency while delivering a bold motorsport-inspired look. The diffuser follows factory body lines precisely and installs with no modification required for a seamless finish.

Fitment:

• 2021+ BMW M3 (G80)

• 2021+ BMW M4 (G82 / G83)

Features:

• Prepreg carbon fibre construction

• Enhanced underbody airflow and aerodynamic efficiency

• Sharper, more aggressive design to complement quad exhaust layout

• OEM-level fitment with no modification required

• Designed to integrate seamlessly with the full G8X aero package

Package content:

• One Prepreg Carbon Fiber Rear Diffuser V2

Complete the rear profile of your G8X with a diffuser that blends performance-focused design with premium craftsmanship.

We offer free shipping within the Continental U.S, for Headlights, Taillights, DRLs and Carbahn controllers. For Exterior and Performance products, standard shipping rates apply, We also ship worldwide, with rates automatically calculated at checkout.

Please note:
• For Retrofits, you are purchasing a headlight modification service.
• If you select "Shipping own headlights to BayOptiks for modification", you are required to send us your headlights.
• If you choose "Purchase new OEM headlights", we will order and modify a new OEM headlight for you.
• Once your customizations are complete, we will ship it to you!

• Complete Headlights: 3-5 business days for order processing plus shipping time.
• Custom & Pre-Built Headlights: 6-8 weeks depending on the complexity and component availability.
• New OEM and cores: 6-8 weeks plus an additional 4-8 weeks as these are special orders base on the vehicle VIN due to different versions (North American, European, etc.)
• DRLs, Taillights and Carbon Fiber Aero: 3-5 business days for order processing, plus shipping time.
• Lens Replacements: 1-3 weeks plus shipping time.