3DDesign Carbon Fibre Side Skirts / Skirt Extensions / Side Splitters (CFRP 2x2 Twill) for BMW X3 M & X4 M (X3M/X4M, 2019+, F97 F98) – Rocker Panel Sill Extensions, Side Blades, Aero Body Kit Upgrade
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Elevate the look and road presence of your F97 and F98 with premium carbon side extensions from 3DDesign. Crafted from authentic CFRP with a 2x2 twill weave, these sill extensions deliver a sharper profile, purposeful aero along the flanks and a factory-plus finish that complements BMW M body lines. This is the sleek styling upgrade enthusiasts choose when they want a motorsport-inspired aesthetic without compromise.
Why this upgrade
Vehicle-specific design for the 2019 onwards F97 and F98 platforms for a tailored, precise fit
Authentic carbon fibre reinforced plastic with consistent 2x2 twill weave for a premium appearance
Lightweight and rigid construction that enhances the stance and side profile
Complements other aero pieces such as front lips and rear diffusers for a cohesive look
Transforms the visual width and lowers the side view for a more aggressive, performance-focused style
We have fitted these to customer cars at MJ Modifications and the feedback has been outstanding. Owners love the clean fit, quality weave and how dramatically the vehicle’s silhouette is enhanced.
What you receive
2 x 3DDesign carbon fibre side skirt extensions (CFRP, 2x2 twill)
Installation hardware
Vehicle compatibility
BMW X3 M, 2019 onwards, F97 chassis
BMW X4 M, 2019 onwards, F98 chassis
Fitting and support
Professional installation recommended. For a hassle-free fitment service, choose MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.
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