Do I need a new rear bumper to fit a diffuser?

Usually not. A diffuser mounts under the factory bumper. Replace the bumper only when the opening, the vents or the exhaust exit have to change.

What happens to the parking sensors?

They transfer to the new shell. Confirm the sensor layout of your exact trim on the enquiry — it differs between trims of the same model.

Is the diffuser included with the bumper?

On the designs where the two are one assembly, yes. Where they are separate the kit lists them separately. Match them from the same design either way.

Can the exhaust exit be changed?

The bumper design fixes the exit position. Tell us which exhaust system the car runs before tooling or ordering — a mismatch here is not adjustable afterwards.

Aero parts · made to order

Rear Bumpers

rear bumper conversions across the range — for the builds where the diffuser opening, the vents or the exhaust exit have to change shape.

Request quote

CMST carbon fiber rear bumpers — Nissan GT-R R35

Why a rear bumper gets replaced

Weave / surface

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

Supply terms

Replaces: The factory rear bumper cover in full
Often supplied with: Rear bumper vent trim, and the matching diffuser where the design integrates them
Fitting: Bodyshop work — parking sensors and reflectors transfer to the new shell
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 default for bumper shells.
Vacuum carbon
Gloss clear coat, for bumpers meant to show weave.
PP
Injection molded, molded-in black, the most impact-tolerant grade.

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 I need a new rear bumper to fit a diffuser?: Usually not. A diffuser mounts under the factory bumper. Replace the bumper only when the opening, the vents or the exhaust exit have to change.
What happens to the parking sensors?: They transfer to the new shell. Confirm the sensor layout of your exact trim on the enquiry — it differs between trims of the same model.
Is the diffuser included with the bumper?: On the designs where the two are one assembly, yes. Where they are separate the kit lists them separately. Match them from the same design either way.
Can the exhaust exit be changed?: The bumper design fixes the exit position. Tell us which exhaust system the car runs before tooling or ordering — a mismatch here is not adjustable afterwards.

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)