CMST BMW 3 Series F30 Carbon Widebody Aero Kit
The CMST BMW 3 Series F30 kit is a widebody aero package built from PP bumpers, FRP arches and fenders, and dry carbon-fibre lips, skirts and bonnet, designed for the F30-generation 320i, 328i and 335i. It widens the compact F30 saloon, drops its visual ride height with a carbon front lip and rear lip, and is commonly fitted alongside an M3/M4-style front-end conversion. Like CMST's larger BMW kits, it mixes three materials on purpose — PP for the bumpers, FRP for the flares, and carbon fibre for the highlight pieces — so the build looks premium where it is seen up close while keeping the big panels practical to paint and repair.
- Vehicle: BMW 3 Series F30 saloon (2012–2019), including 320i, 328i, 330i and 335i/340i
- Style: Widebody aero kit, often paired with an M3/M4-look front conversion
- Material options: PP (front and rear bumpers), FRP (arches, fenders, side skirts, boot lid), dry carbon fibre (front lip, rear lip, rear corners, skirt lower lips, bonnet)
- Key pieces: PP front bumper, carbon front lip, vented carbon bonnet, FRP front arches and fenders, side skirts with carbon lips, PP rear bumper, carbon rear lip with corners, FRP rear arches, FRP boot lid
- Finish: PP and FRP supplied in primer for paint-matching; carbon in gloss twill weave under clearcoat
- Exhaust option: SUS304 stainless valved cat-back, dual-twin exit, remote-control valve, carbon tips
What the CMST F30 widebody kit is
The F30 is the 2012–2019 3 Series saloon — a clean, compact sports saloon that responds well to a wider, more aggressive body. CMST's kit flares the arches, deepens the bumpers, and adds carbon detailing to turn a standard 320i or 335i into a purposeful widebody build. The materials are split by job: PP (polypropylene) forms the bumpers; FRP (fibreglass-reinforced plastic) forms the arch flares, fenders, side skirts and a replacement boot lid; and dry carbon fibre forms the front lip, rear lip, rear corners, skirt lower lips and bonnet. AME carries the complete CMST catalogue and the broader BMW body kit range, so an F30 owner can plan the conversion in stages.
This is a styling-led conversion rather than a downforce-focused track kit. The flares, lips and bonnet vents give the F30 a wide, planted, M-inspired look; the value is in the stance and the carbon detailing, not in claimed aero numbers. Matching the wheels, tyres and ride height to the widened body is what makes the build read as a whole.
Front end: PP bumper, carbon lip and an M-look conversion
The front of the kit centres on a PP front bumper, frequently fitted as part of an M3/M4-style front conversion that swaps the standard F30 face for a more aggressive M-look bumper and grille. Below it sits a dry-carbon front lip that drops the leading edge and gives the car the low front a standard F30 lacks. Using PP for the bumper matches BMW's own material, so the painted bumper flexes and behaves like factory bodywork, while the carbon lip stays in its clearcoated weave finish underneath. Browse the equivalent parts through AME's CMST front lip for BMW and CMST bumper for BMW collections.
Carbon bonnet: weight off the nose, heat out of the bay
The bonnet is a full dry-carbon-fibre replacement for the steel original, with vents moulded into the panel. Replacing steel with carbon removes weight from high and far forward on the F30 — the most useful place to shed mass for turn-in — and the vents help extract hot air from the engine bay, useful on the turbocharged 328i and 335i. It is also the single biggest visual change to the front, adding the aggression the standard F30 keeps understated. As with any aftermarket bonnet, confirm the latch and any safety pins engage correctly before driving, since the carbon panel is lighter than the factory steel.
Widebody arches, fenders and side skirts
The widebody hardware is FRP: flared front and rear arches that push the bodywork out for a wider track stance, plus FRP front fenders with integrated air outlets. The extra width gives the F30 room to run wider wheels and tyres tucked under the flares rather than poking proud of the bodywork. Down the sides, FRP side skirts carry dry-carbon lower lips, continuing the body-colour-plus-carbon theme along the sills and visually lowering the car. Because the FRP panels are supplied in primer, they are painted body-colour during fitment so the flares blend into the F30's lines. The related guard and skirt components sit in AME's CMST fenders for BMW and CMST side skirts for BMW collections.
Rear: PP bumper, carbon rear lip and corners
The rear mirrors the front. A PP rear bumper anchors the tail, finished with a dry-carbon rear lip and carbon rear corners that frame the lower bumper and give the back a diffuser-style edge to balance the front lip. CMST also supplies an FRP boot lid, which lets the car carry a reshaped or spoiler-integrated bootlid to complete the M-look. The body-colour PP and clearcoated carbon repeat the two-tone treatment from the front. For the rear lip and diffuser-style components, see AME's CMST diffuser for BMW range, and for boot spoilers the CMST spoiler for BMW collection.
Optional SUS304 valved exhaust
The F30 build can be finished with a CMST valved cat-back exhaust in SUS304 stainless steel with a brushed finish, a dual-twin (quad) exit, and carbon-fibre tips. A remote-controlled valve lets the driver switch between a quiet, civil note when closed and a louder, freer-flowing tone when open. CMST's general design goal is to reduce back-pressure so the engine breathes more easily, which can improve high-rpm response and the overall driving feel; on a turbocharged F30 the practical benefits come mainly from the freer flow and the on-demand sound rather than from any single quoted power figure. The carbon tips resist heat discolouration better than chrome and keep their finish over time. The full range is listed under CMST cat-back exhaust.
PP, FRP and dry carbon: why CMST uses three materials
Each material in this kit is chosen for a specific role, and the split is worth understanding before budgeting a build:
- PP (polypropylene) is used for the bumpers — the same flexible plastic BMW uses on factory bumpers. It absorbs minor knocks without cracking and paints up to look exactly like OEM bodywork, which is why it suits the front and rear bumper shells.
- FRP (fibreglass-reinforced plastic) is used for the larger flared panels — arches, fenders, skirt bodies and the boot lid. It is affordable for big surfaces, repairable, and straightforward to paint body-colour.
- Dry carbon fibre (autoclave-cured pre-preg) is used for the highlight pieces — front lip, rear lip, rear corners, skirt lower lips and bonnet. It is lighter and stiffer, and it carries the woven twill finish that defines the build's carbon detailing.
The result behaves like factory bodywork where it needs to, stays affordable across the big panels, and shows carbon weave where the eye lands. 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
An F30 widebody conversion is a body-shop project. The FRP arches and fenders, and the PP bumpers, all need trial-fitting, panel-gap setting against the adjacent OEM panels, and painting in primer-to-colour so the flares and bumpers blend into the bodywork. The carbon lips and skirt lips are mounted with the correct mix of bolts, clips and panel-safe adhesive. If the build includes an M3/M4-look front conversion, the grille, bumper and bonnet need to be fitted together so the new face lines up cleanly. 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 F30 pieces and advise on staging the work; start with the CMST body kit for BMW range.
Frequently asked questions
Which BMW does the CMST F30 kit fit?
It is designed for the F30-generation BMW 3 Series saloon, built from 2012 to 2019. That covers the four-door 320i, 328i, 330i, 335i and 340i. It is shaped to the F30 body, so confirm your car is an F30 saloon (not the F31 Touring, F34 GT or the later G20) before ordering.
Is the whole kit carbon fibre?
No. It is a three-material kit by design. The front and rear bumpers are PP (polypropylene), the arch flares, fenders, side-skirt bodies and boot lid are FRP (fibreglass-reinforced plastic), and the front lip, rear lip, rear corners, skirt lower lips and bonnet are dry carbon fibre. The PP and FRP parts are supplied in primer for painting; the carbon parts are finished in gloss twill weave.
Can I fit it to a standard F30, or do I need the M-look conversion?
The kit is commonly fitted with an M3/M4-style front-end conversion, but the components are modular. You can fit the carbon front lip, bonnet and widebody arches to a standard F30, or go the full M-look route with the matching front bumper and grille. Discuss your starting car with AME so the right combination of pieces is specified.
Does the kit add downforce?
It is a styling-led widebody rather than a track aero kit. The deeper bumpers, carbon lips and vented bonnet give the F30 a wide, planted look, but CMST does not publish specific downforce figures for it. If you want measurable aero, treat the lips and any wing as visual upgrades and budget separately for suspension and tyre changes.
What does the valved exhaust do?
The optional SUS304 stainless cat-back has a remote-controlled valve and carbon tips. With the valve closed the exhaust is quiet and civil; with it open the note is louder and the gases flow more freely. CMST designs it to lower back-pressure for sharper high-rpm response, with the main day-to-day benefit being the on-demand sound and the freer-flowing tone rather than a single headline power figure.
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, then add the widebody arches and bumpers later. Contact AME Motorsport to confirm current availability of individual F30 pieces.
Build your F30 with AME Motorsport
If you are planning a widebody conversion for a 2012–2019 BMW 3 Series F30, AME Motorsport can supply the CMST PP, FRP and carbon components and help you stage the build from a carbon lip-and-bonnet upgrade to the full M-look widebody. 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 F30.