Do the arches bolt on or does the factory panel have to come off?

Both exist and it depends on the kit. Bolt-on arch sets sit over the factory panel; replacement fenders and quarter panels take it off. The kit description states which, and it changes the fitting labour substantially.

What wheels do I need?

Wider wheels with a revised offset — the exact figures depend on the kit and are supplied as fitment data. Send the wheel spec you intend to run with the enquiry so it can be checked against the arch clearance.

Can I fit a widebody arch set to a car that already has a CMST body kit?

The lip, skirts and diffuser of a widebody kit are sized to the wider body, so the standard-width parts will not line up with the new arches. Order the widebody versions of those panels.

Is the conversion reversible?

Bolt-on arch sets are, allowing for the fixing holes. Replacement panels are not — the factory fender or quarter panel is removed.

Which material for a widebody conversion?

FRP for most, because the car is being painted anyway and FRP arrives primed. Carbon grades are used where the arches are meant to show weave.

Aero parts · made to order

Widebody Kits

A widebody kit changes the track of the car, not just its face — arches or full replacement panels, with the aero set matched to the new width.

Request quote

Close-up of a CMST widebody conversion — flared rear arch and GT wing, studio shot

Arches or replacement panels

Weave / surface

Woven
Forged
Honeycomb
3K woven
Gloss
Matte
Paintable / unpainted
Painted black

Can be ordered as

Rear canards only

Sections of this part are quoted separately — you do not have to take the whole assembly.

Supply terms

Two constructions: Bolt-on arch sets · full replacement fenders and quarter panels
Requires: Wider wheels and revised offset — fitment data supplied with the kit
Supplied with: Matched lip, skirts and diffuser sized to the wider body
MOQ: 1 piece, mixed across parts and vehicles
Lead time: 7–20 days on standard orders
Warranty: 3 months on carbon parts from the date of fitting
Packing: CMST-branded export packaging with product label and parts pack

Every mold starts from the car's own body surface. A 3D-printed sample is trial-fitted on a real vehicle before the mold is cut, and the first production part is fitted again before it ships.

Find your vehicle

Every vehicle below has at least one part in this category. Open a vehicle to see its kits, the material grades it is tooled in and what each kit contains.

Marques carrying this part

All marques

Grades this part is tooled in

FRP
Primed and paint-ready. The usual grade for arch sets and replacement panels, because a widebody conversion is painted body color anyway.
Vacuum carbon
Gloss clear coat, for conversions that show carbon rather than paint.
Dry carbon
Prepreg, lightest, finished twill or forged weave. Used on show and track builds.

Five grades run through the same molds. Ask for the grade by name on the quote — it changes weight, finish on arrival and price band, not fitment.

Questions buyers ask

Do the arches bolt on or does the factory panel have to come off?: Both exist and it depends on the kit. Bolt-on arch sets sit over the factory panel; replacement fenders and quarter panels take it off. The kit description states which, and it changes the fitting labour substantially.
What wheels do I need?: Wider wheels with a revised offset — the exact figures depend on the kit and are supplied as fitment data. Send the wheel spec you intend to run with the enquiry so it can be checked against the arch clearance.
Can I fit a widebody arch set to a car that already has a CMST body kit?: The lip, skirts and diffuser of a widebody kit are sized to the wider body, so the standard-width parts will not line up with the new arches. Order the widebody versions of those panels.
Is the conversion reversible?: Bolt-on arch sets are, allowing for the fixing holes. Replacement panels are not — the factory fender or quarter panel is removed.
Which material for a widebody conversion?: FRP for most, because the car is being painted anyway and FRP arrives primed. Carbon grades are used where the arches are meant to show weave.

Related categories

Talk to the factory

Tell us the vehicle and your market

Quotes come back with kit content, material options and lead time. Tuning shops and distributors only — we do not sell to vehicle owners.

Replies within 12 hours (GMT+8, Mon–Sat)