$595.00 USD
$595.00 USD




Give the rear of your BMW 3 Series G20 or G21 LCI (2023+) a bold and sporty transformation with the TRE Carbon Fiber Performance Rear Diffuser Set. Designed to complement the updated LCI styling, this diffuser set adds depth, definition, and aerodynamic character to your factory bumper.
Pre-Preg Carbon Fiber Construction – Lightweight and durable with a consistent weave and flawless surface finish
Multi-Piece Performance Design – Includes all key diffuser components for a complete rear-end upgrade
High-Gloss UV-Resistant Coating – Resists fading, yellowing, and environmental wear
Precision Fitment – Engineered to align perfectly with OEM mounting points for a clean install
Aerodynamic Functionality – Sculpted fins help manage airflow for enhanced stability and performance aesthetics
Built using pre-preg carbon fiber, the TRE diffuser set is both visually striking and engineered for long-term durability. The multi-piece layout delivers a performance look that mimics higher-tier M models while maintaining perfect integration with the factory bumper.
Whether paired with a performance exhaust or installed as a standalone styling piece, the TRE Carbon Fiber Performance Rear Diffuser Set brings a refined, motorsport-inspired finish to your 3 Series.
One Complete Carbon Fiber Rear Diffuser Set (Multi-Piece)
Installation Hardware (if applicable)
BMW 3 Series G20 LCI (2023+)
BMW 3 Series G21 LCI (2023+)
Upgrade your BMW’s style and aerodynamics with the TRE Carbon Fiber Performance Rear Diffuser Set today.
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.