BMW G20/G21 M340i Carbon Fibre KB Style Rear Diffuser

BMW G20/G21 M340i Carbon Fibre KB Style Rear Diffuser

Elevate the rear styling of your BMW G20/G21 M340i with the KB Style Carbon Fibre Rear Diffuser. Designed specifically for the BMW G20 Sedan and G21 Touring M340i, this premium rear diffuser delivers an aggressive motorsport-inspired appearance while enhancing the vehicle's aerodynamic profile and perfectly complementing the factory rear bumper.

Manufactured from premium carbon fibre, the KB Style Rear Diffuser combines lightweight construction with exceptional strength and durability. Featuring a bold multi-fin design, integrated side extensions, and a centrally mounted LED rear light, it creates a lower, wider, and more purposeful rear-end while maintaining a premium OEM+ fit and finish.

Whether you're building a refined daily driver or a fully customised performance vehicle, the KB Style Carbon Fibre Rear Diffuser is the perfect finishing touch.

Key Features

Premium Carbon Fibre Construction

Manufactured from high-quality carbon fibre for exceptional strength, lightweight performance, and long-lasting durability.

Integrated LED Rear Light

Features a centrally mounted LED rear light that adds a modern motorsport-inspired appearance while enhancing rear visibility.

High-Gloss UV Resistant Finish

Finished with a premium UV-resistant clear coat to help protect against fading, yellowing, and environmental exposure.

Aggressive KB Style Design

Features sculpted aerodynamic fins, integrated side extensions, and a bold KB Style profile for a striking race-inspired appearance.

Improved Aerodynamics

Designed to help optimise airflow beneath the rear of the vehicle while complementing the factory aerodynamic characteristics.

Precision Fitment

Engineered specifically for the BMW G20 Sedan and G21 Touring M340i, ensuring excellent fitment and seamless integration with the factory rear bumper.

Lightweight Construction

Carbon fibre construction provides exceptional rigidity while keeping additional weight to an absolute minimum.

Performance Benefits

Enhanced Rear-End Styling

Transforms the rear of your M340i with a lower, wider, and significantly more aggressive appearance.

Improved Aerodynamic Profile

The integrated diffuser fins help optimise airflow beneath the vehicle while complementing other aerodynamic upgrades.

Race-Inspired LED Styling

The integrated LED rear light adds a distinctive motorsport aesthetic inspired by modern GT and touring race cars.

Completes Your Carbon Fibre Build

Pairs perfectly with carbon fibre front lips, side skirts, mirror caps, rear spoilers, and other exterior upgrades for a cohesive performance-inspired appearance.

Vehicle Fitment

BMW G20 M340i Sedan (2019+)

BMW G21 M340i Touring (2019+)

Please Note

Professional installation is strongly recommended.

Designed specifically for BMW G20 Sedan and G21 Touring M340i models.

The integrated LED rear light requires wiring during installation. Installation by a qualified professional is recommended to ensure correct operation.

Minor preparation, alignment, or adjustment may be required during installation to achieve optimal fitment.

Due to the nature of carbon fibre manufacturing, slight variations in weave pattern may occur between products.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — including Volkswagen GTI & R models, Audi S/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.