CMST Widebody Mustang Aero Kit (17-Piece Carbon)
The CMST widebody Mustang aero kit is a 17-piece dry-carbon and FRP wide-arch body kit for the 2015–2017 (S550) Ford Mustang. Its whole theme is width: the designers pushed all four wheel arches outward — the front arches flared roughly 5cm and the rears roughly 6cm — to widen the track and strengthen the body lines. It is cut to suit both the 2.3 EcoBoost and the 5.0 V8 GT, and CMST quotes around 90% fitment accuracy, which is honest shorthand for "designed to fit closely, expect some workshop trial-fitting".
This is a full conversion rather than a single accent piece. It mixes vacuum-formed dry carbon for the visible aero (bonnet, lips, canards, skirts, wing, diffuser) with FRP for the flared fenders and arches, where a slightly more forgiving material makes paint-matching and panel work easier. You can fit the entire kit or build it up piece by piece from the Ford Mustang body kit range.
- Vehicle: Ford Mustang, S550 generation
- Fitment: 2015–2017 S550, both 2.3 EcoBoost and 5.0 V8 GT
- Piece count: 17 parts (full kit)
- Material options: Vacuum/dry carbon fibre and FRP (fibreglass-reinforced plastic); front bumper offered in carbon or FRP
- Arch flare: Front arches ~5cm wider per side, rear arches ~6cm wider per side
- Finish: Exposed twill carbon weave under gloss clearcoat; FRP parts supplied primed for paint
What the CMST widebody Mustang kit is
CMST built this as a complete wide-body conversion for the S550 Mustang, designed so the pieces work as a set around the wider track. Widening the arches is the point: pulling the front guards out about 5cm and the rears about 6cm lets the car sit over a wider wheel-and-tyre package, which is what gives a widebody its planted stance rather than just a more aggressive nose. Because every panel is shaped to the same brief, the lips, skirts and arches share one design language instead of looking like parts from three different brands.
The full 17-piece list is: a 2.3-style carbon bonnet; a front bumper including front lip (carbon and FRP options); a rear lip in the dual dual-exit (双边双出) layout (carbon); side skirts sized for the arch fitment (carbon); front fenders, a 4-piece set (FRP); front wheel arches, a 4-piece set (FRP); rear wheel arches, a 4-piece set (FRP); and a high rear wing (carbon). The valved cat-back exhaust is offered alongside the kit as the performance half of the package. You can browse the matching parts in the CMST body kit for Ford collection and assemble the look you want.
Piece-by-piece breakdown
Front bumper, lip, canards and grille
The front end is the busiest part of the kit, and it is where the carbon-versus-FRP choice shows up most. CMST offers an FRP front bumper paired with a dry-carbon front lip, carbon canards (风刀), and a carbon centre-mesh grille surround. A triangular accent light is designed into the centre section, which gives the nose a signature look at night. The lip is the working aero piece here: a front splitter manages airflow under the nose and trims front-axle lift at speed, which steadies the car on the motorway. The canards add bite at the front corners and help guide air around the wider front wheels. If you want to start at the front, the matching parts are in the CMST front lip for Ford collection.
Tri-peak vented carbon bonnet
The bonnet is an individualised carbon design with a "山"-shaped (tri-peak) centre air outlet and two lightweight carbon vents either side. The tri-peak outlet is functional as much as styling: vents over the engine bay let hot, high-pressure air escape from under the bonnet, which helps underbonnet cooling and reduces lift over the nose. Being carbon rather than the factory steel, the panel is lighter while keeping the rigidity a bonnet needs, and that mass comes off the highest, most forward point of the car. We won't quote a kilogram figure, because the real saving depends on the exact panel and hardware. Compare the options in the CMST carbon bonnet for Ford range.
Widebody arches and vented fenders
The width comes from four FRP wheel arches — a 4-piece set front and a 4-piece set rear — plus FRP front fenders with carbon vents. The front arches add roughly 5cm per side and the rears roughly 6cm, which is what lets the car run a wider, more aggressive wheel-and-tyre setup without the rubber fouling the bodywork. CMST chose FRP for the arches and fenders deliberately: fibreglass is more forgiving to trim, blend and paint than dry carbon, which matters on flared panels that almost always need fettling to sit flush against the factory body. The carbon vents in the front fenders extract air from the wheel wells, reducing pressure build-up behind the front wheels. The wider fenders and guards are catalogued in the CMST body kit for Ford range.
Carbon side skirts
The dry-carbon side skirts are sized specifically to suit the widebody arch fitment, so the line from the front arch to the rear arch stays continuous rather than stepping in at the sills. Visually they drop the car's profile and tie the front lip to the rear; aerodynamically they smooth airflow along the flanks and cut the air spilling under the car from the sides. On a widebody this matters more than on a stock car, because the flared arches create more surface for air to wrap around. The skirt pieces are in the CMST side skirts for Ford collection.
Rear lip and diffuser: dual single-exit vs dual dual-exit
The rear lip is where you choose your exhaust exit layout. CMST offers the rear lip in two versions: dual single-exit (双边单出), with one tip each side, and dual dual-exit (双边双出), with two tips each side. The diffuser section is dry carbon, with the same triangular LED accent treatment carried through from the front, and the strakes underneath help organise airflow leaving the rear of the car. Your choice here should match the cat-back exhaust you fit, because the lip is cut for the tip arrangement. The full kit ships with the dual dual-exit rear lip, but the single-exit version is available if you prefer a cleaner pair of tips.
Carbon GT rear wing
The high rear wing is carbon and finishes the back of the car while doing real aerodynamic work. A raised GT-style wing adds rear downforce and high-speed stability, balancing the front splitter so the car stays composed at speed rather than feeling light at one end. It also reduces the messy low-pressure wake behind a tall coupe, which is part of why a properly sized wing can help rather than simply add drag. See the wing options in the CMST rear wing for Ford collection.
Valved cat-back exhaust
The exhaust is offered as part of the package and is worth treating as its own upgrade. It is built from 304 stainless steel with a brushed finish, runs lighter than the factory system, and flows more freely, which helps the engine breathe. The headline feature is the second-generation remote-controlled valves: they change the pipe path and effective diameter, so you can keep things quiet in the city and open the system up for full sound and a stronger pull at speed. It comes as a cat-back section in both dual single-exit and dual dual-exit layouts to match your rear lip. We won't put a power figure on it, because real gains depend on the engine, tune and the rest of the system — but freer flow and less weight are genuine benefits. The matching systems live in the CMST cat-back exhaust for Ford collection.
Dry carbon vs FRP vs factory PP
This kit uses two aftermarket materials, and the factory parts they replace are a third. Knowing the difference helps you understand why CMST mixes them across the kit.
| Material | Used for on this kit | Strengths | Trade-offs |
|---|---|---|---|
| Dry carbon fibre (prepreg, autoclave-cured) | Bonnet, front lip, canards, grille surround, side skirts, rear lip/diffuser, rear wing | Light and stiff; shows a true woven carbon finish; holds shape and gloss like a quality painted panel | Most expensive; exposed weave needs UV care; harder to modify or repair |
| FRP (fibreglass-reinforced plastic) | Front bumper option, front fenders (4pc), front and rear wheel arches (4pc each) | Strong and easy to trim, blend and paint; ideal for flared arches that need fitting to the body | Heavier than carbon; must be primed and painted to match the car; no visible weave |
| Factory PP (polypropylene) | The original Mustang bumpers and lower trims this kit replaces | Flexible and cheap from the factory; takes minor knocks without cracking | Relatively heavy for its strength; no styling upgrade; not a widebody shape |
Fitment and finish
The single most useful number to understand is that 90% fitment figure. It does not mean the kit is 90% finished — it means the panels are designed to fit closely, but a widebody conversion at this price always needs a workshop to trial-fit, adjust gaps and blend the flared arches into the factory body before final mounting and paint. Treat the quoted accuracy as "very close, then fettled to perfect", not "bolt straight on". Budget for that bodywork time as part of the project.
Two finish jobs follow from the mixed materials. The FRP parts — the bumper option, fenders and all four sets of arches — arrive primed and must be painted to your car's exact colour code by a professional, because Ford's colours shift in different light and a flared arch sits right next to the factory panel where any mismatch shows. The dry-carbon pieces wear an exposed twill weave under a UV-stable clearcoat; keep them out of constant harsh sun where you can, wash with regular car shampoo rather than aggressive solvents, and an occasional wax or paint sealant keeps the clear bright and slows yellowing over years of Australian sun.
Finally, plan the wheel and tyre fitment alongside the arches. The whole reason for ~5cm front and ~6cm rear flare is to clear a wider track, so confirm your wheel offset and tyre width suit the new arch line before you commit — the arches give you the room, but the wheels have to be specified to use it. A workshop experienced with widebody Mustangs will sort clearance, guard rolling if needed, and alignment in one go.
Why carbon and a widebody suit the S550 Mustang
The S550 is a big, broad-shouldered coupe, and a widebody plays to that shape rather than fighting it. Pulling the arches out and dropping the visual height with carbon skirts and lips gives the car the planted, wide-track look that the standard body only hints at. Carbon is the right material for the visible aero because it is light and stiff and finishes like jewellery up close, while FRP is the sensible choice for the big flared panels that need blending and paint. Put together, the kit turns a fast factory coupe into a coherent wide-body build without resorting to a different panel supplier for every piece. You can plan the whole project from the broader body kit range, or start with a single carbon piece from CMST and grow the build over time.
Frequently asked questions
Will this kit fit my Mustang's year and engine?
The CMST widebody kit is designed for the 2015–2017 S550 Ford Mustang, and it suits both the 2.3 EcoBoost and the 5.0 V8 GT. The bodywork is shared across those engines for this generation, so the arches, lips and skirts fit either car. If your Mustang is a later facelift or a different generation, check with us first, because the bumpers and panels differ.
How many pieces are there, and can I buy them individually?
The full kit is 17 pieces: the carbon bonnet, front bumper with lip, carbon rear lip, carbon side skirts, four-piece FRP front fenders, four-piece FRP front arches, four-piece FRP rear arches, and the carbon rear wing, with the valved cat-back exhaust offered alongside. You do not have to buy all of it at once — the pieces are available individually, so you can start with, say, the bonnet and front lip and add the arches and wing later.
What does "around 90% fitment" actually mean?
It means the panels are designed to fit closely but expect some workshop trial-fitting and adjustment before final mounting and paint. On a widebody conversion that is normal: gaps need setting, the flared arches need blending into the factory body, and everything is fettled to sit flush. Treat 90% as "very close, then finished by a professional", and budget for that bodywork time.
Do the widebody arches need cutting or modification?
The flared FRP arches are designed to fit over the factory arch line to clear a wider wheel-and-tyre package, and most widebody fitments involve some trimming or rolling of the original guard so the tyre clears at full lock and full suspension travel. The exact amount depends on the wheel offset and tyre width you choose. A workshop experienced with widebody Mustangs will handle any guard rolling, fitting and alignment.
What is the difference between the dual single-exit and dual dual-exit exhaust?
Dual single-exit (双边单出) gives you one exhaust tip on each side; dual dual-exit (双边双出) gives you two tips on each side for a fuller look. The rear lip is cut to match the exit layout, so choose the rear lip version and the cat-back exhaust together. The full kit ships with the dual dual-exit rear lip, but the single-exit version is available if you prefer a cleaner pair of tips.
Dry carbon or FRP — which parts are which, and does it matter?
The visible aero — bonnet, front lip, canards, grille surround, side skirts, rear lip/diffuser and rear wing — is dry carbon for its light weight, stiffness and woven finish. The flared fenders and all four sets of wheel arches are FRP, which is easier to trim, blend and paint where the panels meet the factory body. The front bumper is offered in either material. It matters mainly for finish: carbon parts show a clearcoated weave, while FRP parts must be painted to your car's colour.
Do I need professional fitment?
Yes, we strongly recommend it. A widebody conversion is real bodywork: blending the flared arches, setting panel gaps, painting the FRP parts to your colour code, and sorting wheel and tyre clearance all need a workshop. A professional experienced with carbon and widebody Mustangs will give you a factory-grade result rather than one that looks slightly off.
Ready to build your S550? Explore the full CMST carbon-fibre body kit for the Ford Mustang at AME Motorsport, choose the carbon and FRP pieces that suit your car, and our Australian team can help you plan fitment, wheel clearance and paint.