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The CMST BMW 5 Series F10 kit is a widebody aero package that mixes FRP bumpers and arches with dry carbon-fibre lips, skirts, bonnet and wing, and flares the body by 5 cm at the front and 6 cm at the rear. It is shaped for the F10-generation 5 Series (the 2010–2017 saloon, including 528i, 535i and 550i), and it turns the executive F10 into a low, wide, carbon-detailed build without changing the car's core silhouette. The two-material approach is deliberate: FRP keeps the large flared panels affordable and repairable, while carbon fibre carries the visual highlights where the weave is seen up close.

• Vehicle: BMW 5 Series F10 saloon (2010–2017), including 528i, 535i, 550i and F10 M5-look builds
• Style: Widebody — +5 cm per side at the front, +6 cm per side at the rear
• Material options: FRP (bumpers, arch flares, fenders, side skirts) and dry carbon fibre (front lip, corners, bonnet, rear lip, skirt lower lips, wing)
• Key pieces: Front bumper, three-piece carbon front lip, vented carbon bonnet, four-piece front arches, six-piece rear arches, side skirts with carbon lower lips, carbon rear lip with corners, adhesive-mount carbon rear wing
• Finish: FRP supplied in primer for paint-matching; carbon pieces in gloss twill weave under clearcoat
• Exhaust option: SUS304 stainless valved cat-back with carbon tips

What the CMST F10 widebody kit is

The F10 is one of BMW's most upright, business-suited saloons, which is exactly why a widebody conversion changes its character so completely. CMST's kit pushes the wheel arches out 5 cm at the front and 6 cm at the rear, giving the car a wider track stance and room to run a more aggressive wheel-and-tyre fitment. Rather than using one material, CMST splits it: the large, impact-prone panels — bumpers, arch flares, fenders and skirt bodies — are FRP (fibreglass-reinforced plastic), while the parts seen up close, such as the front lip, rear lip, skirt lower lips, bonnet and wing, are dry carbon fibre. AME stocks the full CMST range alongside the wider BMW body kit catalogue, so an F10 owner can build the look in stages.

This is a styling-led widebody rather than a track aero kit. The flares, deeper bumpers and carbon lips give the F10 presence and a planted look; they are not claimed to add measurable downforce. Matching the wheels and ride height to the widened body is what makes an F10 conversion look resolved rather than bolted-on.

Front end: FRP bumper with a carbon lip and corners

The front of the kit pairs an FRP front bumper with a vacuum-formed dry-carbon front lip and separate carbon front corners. The contrast is deliberate: the painted FRP bumper reads as bodywork, while the gloss carbon lip and corners sit below it as a distinct lower line. The lip drops the leading edge of the bumper to give the F10 the low front it lacks as standard, and the corner pieces wrap the outer edges to tie the lip into the widened arches.

Because the bumper is FRP and supplied in primer, it is painted to match the car's colour during fitment; the carbon lip stays in its clearcoated weave finish. That two-tone front — body-colour bumper, carbon lip — is a signature of this build. Browse the equivalent parts through AME's CMST front lip for BMW and CMST bumper for BMW collections.

Carbon bonnet: lighter, and vented for cooling

The bonnet is a full dry-carbon-fibre replacement for the steel original, with vent openings moulded into the panel. Swapping steel for carbon removes weight from high up and far forward on the car, the most useful place to lose mass for steering feel, and the vents help release hot air from the engine bay. On the F10's long bonnet the central power-dome and twin vent banks add the visual aggression the standard car keeps under wraps. As with any aftermarket bonnet, check that the latch and any safety pins engage correctly before driving, since the carbon panel is lighter than the factory steel.

Widebody arches and fenders

The widebody hardware is the heart of this kit. CMST supplies four-piece FRP front arches and six-piece FRP rear arches, flaring the body 5 cm per side at the front and 6 cm per side at the rear, plus FRP front fenders with integrated air outlets. The extra width does two jobs: it gives the F10 a genuinely wide stance, and it creates clearance for wider wheels and tyres tucked under the flares rather than poking out. Splitting the arches into sections makes them easier to fit around the existing bodywork and to paint. Like the bumpers, the FRP arches and fenders are painted body-colour, so the widebody reads as one continuous panel rather than an add-on. See the related CMST fenders for BMW range for the front guard components.

Sides and rear: skirts, rear lip and a fixed wing

Along the flanks, FRP side skirts carry dry-carbon lower lips, repeating the body-colour-plus-carbon theme down the sills and visually pulling the car towards the road. At the back, an FRP rear bumper is finished with a carbon rear lip and carbon rear corners, framing the lower bumper and giving the tail a diffuser-style edge to match the front. Topping the boot is a dry-carbon rear wing that CMST builds as an adhesive, stick-on design: it bonds to the boot lid without drilling, keeping installation simple and the bootlid skin intact while still giving the F10 a three-dimensional rear.

For the wing and spoiler options, AME lists the CMST spoiler for BMW and CMST side skirts for BMW collections, and the diffuser-style rear components sit in the CMST diffuser for BMW range.

Optional SUS304 valved exhaust

The F10 build can be finished with a CMST valved cat-back exhaust in SUS304 stainless steel with a brushed finish and carbon-fibre tips. The valves let the exhaust run quiet and civil when closed and open up for a louder, freer-flowing note on demand. CMST's design intent is to reduce back-pressure so the cylinders breathe more easily; on a turbocharged F10 such as the 535i or 550i the practical gains come mainly from the freer flow and the on-demand sound rather than any single headline power figure. The carbon tips also resist heat discolouration better than chrome. The exhaust range is listed under CMST cat-back exhaust.

FRP vs dry carbon: why CMST mixes the two

The two materials are chosen for different jobs, and the split helps when budgeting a build:

• FRP (fibreglass-reinforced plastic) is used for the big panels — bumpers, arch flares, fenders and skirt bodies. It is more affordable per square metre and straightforward to repair and paint, which makes it the sensible choice for large widebody surfaces that get painted body-colour anyway.
• Dry carbon fibre (autoclave-cured pre-preg) is used for the highlight pieces — front lip, rear lip, skirt lower lips, bonnet and wing. It is lighter and stiffer, and it shows the woven twill finish that gives the build its carbon detailing where it is seen up close.

The result is a kit that looks premium where it counts and keeps the large panels practical. The full carbon and mixed-material range sits in AME's CMST carbon fibre body kit and CMST body kit for BMW collections.

Fitment and finish in Australia

A widebody conversion is a body-shop job, not a driveway one. The FRP arches, fenders and bumpers need trial-fitting, panel-gap setting against the adjacent OEM panels, and painting in primer-to-colour so the flares blend into the F10's lines. The carbon lips and wing are mounted with the correct mix of bolts, clips and panel-safe adhesive, and the stick-on wing needs a clean, properly prepared surface to bond reliably. Anything that changes the car's external width or ride height should be fitted with roadworthiness in mind, so keep wheel fitment and any suspension changes sensible for road use in your state. AME can supply the CMST F10 pieces and advise on staging the work; start with the CMST body kit for BMW range.

Frequently asked questions

Which BMW does the CMST F10 kit fit?

It is designed for the F10-generation BMW 5 Series saloon, built from 2010 to 2017. That covers the four-door 520i, 528i, 535i and 550i, and it is commonly fitted to create an F10 M5-style look. It is shaped to the F10 body, so confirm your car is an F10 saloon (not the F11 Touring or the later G30) before ordering.

How much wider does the widebody make the car?

The CMST kit flares the body 5 cm per side at the front and 6 cm per side at the rear. That is roughly 10 cm of added width across the front track and 12 cm across the rear, which gives the F10 a noticeably wider stance and room to run a more aggressive wheel-and-tyre package tucked under the arches.

Is the whole kit carbon fibre?

No. It is a mixed-material kit by design. The bumpers, arch flares, front fenders and side-skirt bodies are FRP (fibreglass-reinforced plastic) supplied in primer for painting, while the front lip, rear lip, side-skirt lower lips, bonnet and rear wing are dry carbon fibre finished in gloss twill weave. The split keeps the large panels affordable and repairable while putting the carbon weave where it is seen up close.

Does the kit add downforce?

This is a styling-led widebody rather than a track aero kit. The deeper bumpers, carbon lips and fixed wing give the F10 a low, planted look, but CMST does not claim specific downforce figures for it. If you want genuine aero performance, treat the wing and lips as visual upgrades and budget for suspension and tyre changes separately.

How is the rear wing fitted?

The carbon rear wing is an adhesive, stick-on design that bonds to the F10 boot lid without drilling holes. This keeps the bootlid skin intact and makes installation simpler, but it relies on a clean, properly prepared surface and a quality bonding agent, so it is best fitted by a body shop to ensure it holds securely over time.

Can I buy the pieces separately?

Yes. The kit is built from discrete components, so the build can be staged. Many owners start with the carbon front lip and bonnet for a quick visual lift, then add the full widebody later. Contact AME Motorsport to confirm current availability of individual F10 pieces.

Build your F10 with AME Motorsport

If you are planning a widebody conversion for a 2010–2017 BMW 5 Series F10, AME Motorsport can supply the CMST FRP and carbon components and help you stage the build from a simple lip-and-bonnet upgrade to the full flared kit. Start with the CMST body kit for BMW range, then get in touch to confirm fitment, paint-matching and the wheel package that suits your F10.