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The CMST Li Auto L9 carbon-fibre kit is a satin-finish aero package for the Li L9 full-size SUV, made from carbon fibre and designed to sharpen the L9's nose, sides and tail without changing its proportions. It centres on a front lip that integrates with the factory bumper, an eight-piece side-skirt set, and a rear lip with a layered, two-tier edge. Each piece is moulded to follow the L9's body lines, so the kit reads as a deliberate, OEM-style upgrade rather than an add-on, and the satin carbon weave suits the car's blacked-out, understated styling.

• Vehicle: Li Auto (Li Xiang) L9 full-size SUV
• Material: carbon fibre in a satin (matte-lacquer) finish
• Key pieces: front lip, eight-piece side skirts, two-tier rear lip; pairs with a colour-matched rear diffuser insert
• Look: blacked-out "dark knight" styling with body-side trim and dark wheels
• Finish: satin carbon weave, designed to match gloss-black factory trim

What the kit is

The L9 is Li Auto's flagship six-seat SUV — a large, range-extender EV pitched at the top of the family-SUV market, with a smooth, slab-sided body and minimal exterior fuss. That clean canvas is what makes carbon trim effective on it: there are few existing lines to compete with, so a front lip, skirts and a rear lip read clearly and add definition exactly where the eye expects it. CMST's kit keeps the L9's silhouette intact and adds a lower, more deliberate edge to it, finished in satin carbon so the upgrade looks integrated rather than bolted on.

Piece-by-piece breakdown

Front lip

The front lip is the kit's anchor. Rather than sitting proud of the bumper, it is shaped to merge with the factory front fascia and follow every panel gap, extending the lower edge forward to give the tall L9 a lower visual centre of gravity. On a big SUV, that small drop at the nose does a lot of work: it grounds the front, tightens the gap between body and road, and sets up the line that the side skirts then carry rearward.

Eight-piece side skirts

The side skirts come as an eight-piece set, which is what allows them to wrap the L9's long doors and lower sills cleanly and follow the body's subtle curvature. Run together with the car's blacked-out side trim and dark wheels, they draw a continuous low line down the flanks that visually lowers the ride height and ties the front lip to the rear. Splitting the skirts into multiple pieces also makes them far easier to fit accurately on a vehicle this size and simpler to replace if a section is kerbed.

Two-tier rear lip and diffuser

At the tail, the rear lip is given a two-tier profile that intentionally echoes the layering of the front lip, so the car looks consistent front to back. Paired with a colour-matched rear diffuser insert and the dark body trim, it adds depth low on the tailgate and finishes the "dark knight" look the kit is built around. The effect is a fuller, more planted rear without a wing or any change to the L9's family-friendly tailgate function.

Building the "dark knight" look

The L9 kit is designed to read as a single coordinated theme rather than a set of separate add-ons, and that intent shows in how the pieces work together. The satin carbon front lip, skirts and rear lip share the same finish, so the eye travels cleanly from nose to tail without a break. Paired with the L9's existing gloss-black body-side trim, dark glass and dark wheels, the carbon completes a blacked-out, "dark knight" aesthetic that suits the car's understated luxury. The colour-matched diffuser insert is the detail that ties the rear together — left dark, it disappears into the theme; matched to the body, it adds a subtle contrast low on the tailgate. The point is cohesion: every piece is chosen so the finished car looks deliberate, not modified, and the satin finish keeps the whole set looking like one considered design rather than a collection of separate accessories.

Why satin carbon on the L9

Two reasons. First, finish: the L9's design leans on gloss-black trim and dark glass, and a satin (matte-lacquer) carbon weave sits more harmoniously against that than high-gloss carbon would — it adds texture without a shiny clash. A gloss weave can look busy next to gloss-black panels, whereas the satin finish reads as a considered, factory-style choice. Second, material: carbon fibre is light and holds a crisp moulded edge, so the lips and skirts keep sharp, defined lines that a softer plastic trim would round off over time. On a large, heavy SUV the weight saving is not the headline; the precise, durable finish is.

Fitment and finish in Australia

The kit is designed to bolt to factory points and follow OEM panel gaps, but careful fitting still matters. We recommend dry-fitting the front lip and each skirt section to set even gaps before final fixing, and using the correct primer and adhesion process so the carbon sits flush along the L9's long sills. The front lip sits low, so an experienced fitter will allow sensible clearance for driveways and speed humps. Australian UV is hard on lacquer, so a ceramic coating or paint-protection film over the satin weave helps it resist hazing and keeps the matte finish even. The diffuser insert can be colour-matched to the body or left dark to suit the blackout theme.

See the kit and related parts in our CMST Body Kit collection, compare weaves and finishes across the range under All Carbon Fibre Body Kit, and read about the brand's carbon process on the CMST page.

FAQ

Does the CMST kit fit my Li Auto L9?

Yes — the front lip, eight-piece side skirts and rear lip are moulded specifically for the Li L9's body. As trims and minor exterior details can change year to year, confirm your build when ordering so we supply the correct sections.

What does "satin" carbon mean?

Satin carbon is real carbon fibre finished with a matte (low-gloss) lacquer instead of a high-gloss clear coat. You still see the woven carbon texture, but the surface is muted, which suits the L9's blacked-out, gloss-black styling better than shiny carbon.

Why are the side skirts in eight pieces?

The L9 has long doors and sills with a subtle curve, so an eight-piece skirt set follows that shape far more accurately than a single moulding. It also makes installation easier to align and means a single kerbed section can be replaced rather than the whole skirt.

Does the kit add downforce?

This is a styling-led kit on a family SUV, so its job is appearance and finish rather than measurable downforce. The lips and skirts tidy the lower bodywork and lower the visual ride height; we make no track-style downforce claims for it.

How is it attached, and can it be removed?

The kit uses a combination of factory mounting points and automotive-grade adhesive, depending on the piece. It is designed as a permanent-feeling upgrade but can be removed by a professional; we recommend professional fitment so the carbon aligns cleanly and the adhesive bonds correctly.

Thinking about a carbon upgrade for your L9? Explore finishes and fitment in our CMST Body Kit range and talk to the AME Motorsport team about specifying yours.