BMW F80 F82 F83 M3 M4 PSM Style CARBON FIBRE Rear Diffuser
Price range: 1,099.99€ through 2,099.99€
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The BMW F80 F82 F83 M3 M4 PSM Style Carbon Fibre Rear Diffuser with Undertray is a complete aerodynamic package that brings both style and substance. It’s more than a diffuser — it’s a system that works under the car to guide airflow, reduce turbulence, and strengthen rear-end stability.
This system includes a multi-piece diffuser shell and an integrated undertray panel, forming a unified airflow channel beneath the car. The diffuser fins sculpt the wake coming off the rear bumper, while the undertray smooths the underside, helping the air rejoin cleanly behind the car. Together they improve downforce, reduce drag, and sharpen the rear profile’s performance character. According to PSM’s product specs, it uses vacuum infusion construction to maintain stiffness while keeping weight in check.
psmdynamic.eu
You get both wet carbon and prepreg carbon versions, so you can choose between value and motorsport-grade precision. The prepreg version is built with stricter resin control and fiber alignment, yielding higher strength-to-weight ratios. In contrast, the wet carbon version carries a slightly higher mass but still offers the striking carbon weave finish that many want.
The PSM style influence shows in the bold geometry: wide, expressive fins tapering into defined cutouts, side wraparounds that extend the diffuser’s visual width, and full coverage across the lower bumper area. As one vendor describes for their 4-piece diffuser + undertray combo, it “wraps around the sides” for a full lower section treatment.
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The finish receives a high-gloss UV-protected clear coat to guard against yellowing, fading, and weather wear — essential for a component exposed to underbody heat, road debris, and the elements.
psmdynamic.eu
For M enthusiasts who demand form backed by function, the PSM Style Carbon Fibre Rear Diffuser + Undertray system is a high-impact upgrade. It brings wind-tuned aggression, visual depth, and real aerodynamic value — all in one complete carbon package.
APPLICATIONS: 2014-2020 BMW M3 F80 M4 F82 F83
PACKAGE INCLUDE: x1 REAR BUMPER DIFFUSER SET
MATERIAL: WET OR DRY CARBON FIBER
COLOR: BLACK CARBON FIBER
FINISH: GLOSSY WITH UV CLEAR COAT
FITMENT: ADD ON SELF TAPPING SCREWS
HIGH-QUALITY AFTERMARKET PRODUCT
PROFESSIONAL INSTALLATION IS HIGHLY RECOMMENDED
ADDITIONAL INFORMATION:
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PREPREG is a common term for a reinforcing fabric such carbon which has been pre-impregnated with a resin system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to be laid into the mold without the addition of any more resin. In order for the laminate to cure, an autoclave production process is used, a combination of high pressure and heat.
- Maximum strength and performance characterictics. In a hand layup production process, it is difficult to achieve 50% fabric and 50% resin content. Typical hand laminates, even when vacuum bagged, end up with a significant amount of excess resin. Excess resin increases brittleness and reduces overall strength properties. On the other hand, most prepregs contain around 35% resin. This is ideal for maximum cured properties and generally impossible to achieve in normal hand lamination.
- Uniformity and repeatability. The prepreg is of uniform thickness and each part coming out of the mold may theoretically be the same. Vacuum bagging technology may have some errors in processing, but prepreg ensures production consistency.
- Reduce curing time. After the thermal curing cycle, no need to wait for the standard 48 hours can be fully cured.
- Aesthetics. Although prepreg processing still requires mold preparation and demoulding, prepreg processing eliminates air bubbles, makes it easier to obtain a smooth, glossy surface as well as eliminates any seaming lines.
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We offer free tracked shipping on all orders within mainland EU. Orders to remote areas such as Malta, Cyprus, and Iceland may incur a surcharge. Worldwide shipping is also available—please contact us for a quote.
Most orders dispatch within one business day (Monday to Friday). EU delivery takes 3–5 working days from dispatch, and tracking details will be provided via email once your order has shipped.
Please note that import taxes may apply outside the EU, and these are the responsibility of the buyer. Some items may ship directly from our suppliers and may have varying delivery times. If an item is out of stock, we will contact you to discuss the available options.
RETURNS
Changed your mind? You can return unused, uninstalled items in original packaging within 30 days of delivery. Return shipping is the customer’s responsibility unless the item is faulty.
Custom, used, or built-to-order items are non-returnable.
Once we receive and inspect your return, refunds are typically processed within 10 business days.
If your item is damaged or incorrect, contact us within 48 hours with photos and order details.
WARRANTY
All VA and VA Motorsports products come with a 1-year limited warranty covering manufacturing defects and fitment issues. For third-party items, warranty terms vary by brand—please check the product listing or contact us for details.
This warranty does not cover wear and tear, incorrect installation, cosmetic damage, labor, or third-party costs.
To start a claim, email us with your order number, issue description, and photos. If the claim is approved, we’ll offer a replacement, store credit, or a refund.
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