Carbon Fibre vs ABS Plastic: Which Body Parts Are Worth Buying?

Jun 26, 2026

By Dubhaus Workshop

When you start shopping for aftermarket exterior parts, you'll quickly notice that most products come in two material options: carbon fibre and ABS plastic. The price difference is often significant, and the marketing around both can make it hard to figure out which one actually makes sense for your build and your budget.

Here's a straight breakdown of what each material offers, where each one is worth paying for, and where you're paying a premium for something that doesn't make a meaningful difference.

What Is ABS Plastic?

ABS (Acrylonitrile Butadiene Styrene) is the most commonly used material in automotive body accessories. It's a high-impact plastic that can be moulded to tight tolerances, painted easily, and is highly resistant to cracking under normal road use. Most factory bumper components, mirror housings, and trim pieces on modern cars are ABS or similar thermoplastics.

In the aftermarket world, ABS body parts are typically supplied in either gloss black or unpainted primer, ready to be painted to match your car's colour. The finish quality on good ABS parts is high — when painted correctly, they're indistinguishable from factory components at a glance.

ABS is also relatively forgiving. If a spoiler or splitter takes a hit from a speed bump or kerb, ABS tends to flex and spring back rather than shattering. This matters on daily driven cars where incidental contact is a reality.

What Is Carbon Fibre?

Carbon fibre is a composite material made from carbon strands woven into a fabric and set in an epoxy resin. It's significantly lighter than steel or aluminium, and depending on the lay-up and grade, can be stronger than either. In automotive applications, carbon fibre is used wherever weight reduction has a meaningful engineering benefit — bonnets, roof panels, spoilers, and structural components on performance and race vehicles.

Pre-preg dry carbon (pre-impregnated carbon fibre) is the highest grade commonly used in aftermarket automotive parts. It's cured under pressure and heat, which produces a denser, more consistent lay-up with a superior surface finish compared to wet-lay carbon. Most of the carbon components in the Dubhaus range are pre-preg.

Weight Difference: Does It Actually Matter?

On a bonnet, yes — the weight difference between a carbon bonnet and a factory steel bonnet is meaningful. A carbon bonnet typically saves 8–12kg from the front axle compared to steel, which improves the front-to-rear weight distribution on a front-heavy car. On a car you're tracking, that's a legitimate handling benefit.

On a rear spoiler or diffuser, the weight savings from carbon vs ABS are much smaller in absolute terms and make essentially no measurable difference to handling dynamics. On these components, you're paying for carbon primarily for its aesthetic — the weave pattern is distinctive and high-end looking — and secondarily for any marginal strength benefit.

Strength

Carbon fibre is not inherently more durable in the context of daily driving. It's stiffer than ABS, which means it has less give when it contacts a kerb or speed bump. A carbon splitter that takes a hit from road furniture may crack or chip, where an ABS splitter in the same situation might flex and survive. If you're fitting a front lip splitter to a car you drive every day on Australian roads, ABS is often the more sensible choice.

For bonnets and structural panels, carbon's stiffness is an advantage — these aren't components that typically contact the road. For lower bodywork like splitters, lips, and diffusers on street cars, ABS is often the more practical option.

Paint and Finish

ABS can be painted to any colour, which means your aftermarket parts can be colour-matched to your car's body. Carbon fibre is typically left with its natural clear-coated weave finish, which means it will always look like carbon — it won't blend into a solid-colour body.

Whether that's a positive or negative depends entirely on your build direction. A carbon bonnet with a matching carbon spoiler on a dark-coloured car looks purposeful and deliberate. The same components on a white or yellow car are a strong contrast statement. Neither is wrong — it's a style decision.

The Honest Bottom Line

For bonnets: carbon is worth paying for. The weight saving is real, the aesthetic is distinct, and it's a component that benefits from carbon's stiffness properties.

For spoilers, splitters, and diffusers on street cars: ABS is often the smarter purchase. You get the same fitment, similar visual presence when painted correctly, and better resistance to incidental contact.

For track cars or show cars where weight and aesthetics are the priority: carbon across the board makes sense.

Dubhaus stocks both materials across the range — browse the spoilers and wings range and the Volkswagen, Subaru, Audi, and Hyundai collections to compare carbon and ABS options side by side for your specific car.